If the initial brake temperature for the first stop in a test procedure (other than S7.7 and S7.16) has not been reached, heat the brakes to the initial brake temperature by making not more than 10 snubs from not more than 40 to 10 mph, at a deceleration not greater than 10 fpsps. If it does, there may be a leak or other problem. Snub means the braking deceleration of a vehicle from a higher reference speed to a lower reference speed that is greater than zero. To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. Stopping distance means the distance traveled by a vehicle from the point of application of force to the brake control to the point at which the vehicle reaches a full stop. 71.1. Turn the key to the on position, do not start the truck. To receive this license, applicants must pass a 50-question test. S5.4.1 Master cylinder reservoirs. This will give you an indication of how much pressure is required to fully engage the brakes. Indirectly Controlled Wheel means a wheel at which the degree of rotational wheel slip is not sensed, but at which the modulator of an antilock braking system adjusts its brake actuating forces in response to signals from one or more sensed wheels. Make 15 stops, each from 60 mph, with the backup system activated for the failed subsystem, to achieve an average deceleration of 12 fpsps for each stop. If its low, there may be a leak somewhere in the system. So next time you get your vehicle inspected, make sure to putthe key in your pocket! xref If it does, theyll know that the starter switch is working properly. S7.10.2 Optional Procedures. Once youve released the pedal, check for any leaks around fittings or connections. S6.2.3 At the beginning of each performance test in the test sequence (S7,3, S7.5, S7.7 through S7.11, and S7.13 through S7.19 of this standard), unless otherwise specified, each propulsion battery of an EV is at the maximum state of charge recommended by the manufacturer, as stated in the vehicle operator's manual or on a label that is permanently attached to the vehicle, or, if the manufacturer has made no recommendation, at a state of charge of not less than 95 percent. Linings are assumed adjusted for normal operating clearance in the released position. For vehicles equipped with more than one brakepower assist or brakepower unit, conduct tests of each in turn. ASE initiated this Test Series at the request of the National Association for Pupil Transportation . Advanced Member, BJ Henderson Each vehicle must be equipped with a service brake system acting on all wheels. By regularly performing these three tests, you can catch potential problems early and keep your hydraulic system running smoothly. Make sure the vehicle is on the level surface and the air pressure is within the normal operating range (cut-out and cut-in). S7.7.1.5 Following observation of the vehicle in a stationary condition for the specified time in one direction, repeat the same test procedure with the vehicle orientation in the opposite direction on the specified grade. Repeat S7.11 except in S7.11.2 run 15 fade stops or 20 snubs instead of 10. %%EOF This will help you identify any areas where fluid may be leaking from the system. (c) (For vehicles with brake power assist or brake power units with backup systems.) If no recommendations are furnished, run the vehicle in an unburnished condition. AIR BRAKES PRACTICE TEST- A 1. Enhanced content is provided to the user to provide additional context. S5.3.4 When an indicator lamp is activated it may be steady burning or flashing. 1/1.1 One feature is a completely internal adjustment system which is designed to continually keep the brake in proper adjustment. Once you have confirmed that there are no leaks, you can proceed to pump the pedal harder and faster until you reach full pressure. Advanced Member, Thomas Ford 85-16 The tractor protection valve Taking this 50 question Texas CDL practice test will help you prepare for the exam by proving valuable insight into the areas you need to review more thoroughly. Peak friction coefficient or PFC means the ratio of the maximum value of braking test wheel longitudinal force to the simultaneous vertical force occurring prior to wheel lockup, as the braking torque is progressively increased. exact, verbatim wording for each component that must be checked;. will bring you to those results. a. Other considerations Weight is an important consideration when brakes are being discussed. (3) Before or upon application of 25 pounds of control force upon a service brake with a brake power assist unit. Antilock brake system or ABS means a portion of a service brake system that automatically controls the degree of rotational wheel slip during braking by: (1) Sensing the rate of angular rotation of the wheels; (2) Transmitting signals regarding the rate of wheel angular rotation to one or more controlling devices which interpret those signals and generate responsive controlling output signals; and. Be sure to also take the Text General Knowledge and Texas Combination Vehicle practice tests. Subscribe to: Changes in Title 49 :: Subtitle B :: Chapter V :: Part 571 :: Subpart B :: Section 571.105. S6.15 Selection of compliance options. (b) In a final stop, at an average deceleration that is not lower than 7 FPSPS for passenger cars (equivalent stopping distance 554 feet) or 6 FPSPS for vehicles other than passenger cars (equivalent stopping distance 646 feet), as applicable, when the inoperative unit is depleted of all reserve capacity. S6.2.5 For tests conducted in neutral, the operator of an EV with no neutral position (or other means such as a clutch for disconnecting the drive train from the propulsion motor(s)) does not apply any electromotive force to the propulsion motor(s). To pass, applicants must answer 40 questions correctly. A vehicle equipped with one or more brake power assist units shall meet the requirements of either S5.1.3.1, S5.1.3.2, or S5.1.3.4 (chosen at the option of the manufacturer), and a vehicle equipped with one or more brake power units shall meet the requirements of either S5.1.3.1, S5.1.3.3, or S5.1.3.4 (chosen at the option of the manufacturer). S5.1.1.4 In the fourth effectiveness test, a vehicle with a GVWR of 10,000 pounds or less shall be capable of stopping from 30 and 60 mph within the corresponding distances specified in column I of table II. S7.4.2.1 Burnish. 0000000954 00000 n S6.2.6 A vehicle equipped with electrically-actuated service brakes also performs the following test series. 0000001722 00000 n So if the key is in your pocket, they wont be able to tell if the starter switch is working or not. Not just because I've been in the truck world too long either. S5.2.2.1 The vehicle's parking brake and parking mechanism, when both are engaged, shall be capable of holding the vehicle stationary (to the limit of traction of the braked wheels) for 5 minutes, in both forward and reverse directions, on a 30 percent grade. Drive for 1.5 mi at 40 mph after the last snub and immediately follow the recovery procedure specified in S7.11.3.2. (c) Unlimited wheel lockup is allowed during spike stops (but not spike check stops), partial failure stops, and inoperative brake power or power assist unit stops. S6.12 Initial brake temperature. Choosing an item from Have you ever wondered why trucks and buses make those funny squeaking and hissing sounds? Release the spring brakes. S7.16 Service brake system - water recovery test. S6.11 Thermocouples. Scope and application. Then, for a vehicle with a GVWR of 10,000 pounds or less, make four stops from 80 mph if the speed attainable in 2 miles is not less than 84 mph. Pre-trips should only take a few minutes, so make sure youre efficient. Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. and 100 F. Application. S5.5 Antilock and variable proportioning brake systems. Great for long drives. Wheel lockup means 100 percent wheel slip. Hydraulic Brakes have hydraulic hoses, tubing, valves, and con- Includes the hydraulic nections leaking, cracked, portion of vacuum actuated pinched, chafed, flat- and compressed-air-over tened, restricted, broken, xb````` Why is there no standard when it comes to the braking systems on large school buses. Average the maximum brake control force required for the three stops. Make three stops from 30 mph at 10 fpsps for each stop. Why Hydraulic Brakes Do Not Work If Bubbles of Air Leak into the Liquid? This content is from the eCFR and may include recent changes applied to the CFR. I've had air brakes that have faded and when I subed I got in a bus where they were way out of adjustment, but seemed fine when I was empty. Restore system to normal at completion of this test. 0000001241 00000 n S7.11.3.2 Vehicles with GVWR greater than 10,000 lb. Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. John Fay is school bus marketing manager for Navistar International. Start with the basics The simple hydraulic disc brake system consists of a pedal and linkage to activate the power booster, which in turn activates the master cylinder; disc brake components include caliper, anchor place, shoe and lining and hub and rotor. Burnish the brakes by making 200 stops from 40 mph at 12 fpsps (the 150 lb control force limit does not apply here). Completed. S6.1.2 For applicable tests specified in S7.5(a), S7.7, S7.8, and S7.9, vehicle weight is lightly loaded vehicle weight, with the added weight, except for the roll bar structure allowed for trucks and buses with a GVWR greater than 10,000 pounds, distributed in the front passenger seat area in passenger cars, multipurpose passenger vehicles, and trucks, and in the area adjacent to the driver's seat in buses. (For vehicles equipped with brake power unit or brake power assist unit.). The letters and background of a single common indicator shall be of contrasting colors, one of which is red. This standard specifies requirements for hydraulic and electric service brake systems, and associated parking brake systems. (a) For an EV equipped with electrically-actuated service brakes deriving power from the propulsion batteries, and with automatic shut-down capability of the propulsion motor(s), the propulsion batteries are at not more than five percent above the EV actual automatic shut-down critical value. They usually always have air ride suspension on the rear that auto levels to what is needed. 101 (49 CFR 571.101) and/or this section, which shall have letters not less than 18-inch high and be legible to the driver in daylight when lighted. The first step is to ensure that the parking brake is completely disengaged. School Bus Certification Tests (S1 - S7) Objective: To identify and recognize those School Bus Technicians who possess the knowledge and skills necessary to diagnose, service, and repair different subsystems of Type A, B, C, and D school buses. Make five stops from 30 mph at 10 fpsps for each stop. The caliper attaches to and slides within an anchor plate or bracket. <<2aa158b17c19dd4986e8916ee1bbfc56>]>> For whatever reason, I feel more in control. Top rated: 3 Lowest rating: 1 Summary of article content: Articles about To test for leaks on hydraulic brake systems: - CDL prep To test for leaks on hydraulic brake systems:: Pump pedal 3 times, then apply firm pressure and hold, Pump pedal 3 times, then get out and look under the S6.9.2 (a) For vehicles with a GVWR greater than 10,000 pounds, road tests (excluding stability and control during braking tests) are conducted on a 12-foot-wide, level roadway, having a peak friction coefficient of 1.02 when measured using an ASTM F2493 standard reference test tire, in accordance with ASTM E1337-19 (incorporated by reference, see 571.5), at a speed of 40 mph, without water delivery. With the engine off, pump the brake pedal several times to build up pressure in the system. Here in Ontario it is all over the map. Where I live (BC Canada) need a special addition to my license for air brakes so I went with hydraulic brakes on my bus. Immediately after each stop accelerate at maximum rate to 30 mph and maintain that speed until making the next stop. 2023 School Bus Fleet Magazine, Bobit. For EVs having a manual control for setting the level of regenerative braking, the manual control, at the beginning of each burnish procedure, is set to provide maximum regenerative braking throughout the burnish. Right Side of School Bus . 17.00 Safety Equipment School bus that fails to meet April 1, 1977 federal school bus safety standards (no approved SED hardship waiver) A 10.02 Registration N/A 4. Brake power unit means a device installed in a brake system that provides the energy required to actuate the brakes, either directly or indirectly through an auxiliary device, with the operator action consisting only of modulating the energy application level. Each brake power unit reservoir servicing only the brake system shall have a minimum capacity equivalent to the fluid displacement required to charge the system piston(s) or accumulator(s) to normal operating pressure plus the displacement resulting when all the wheel cylinders or caliper pistons serviced by the reservoir or accumulator(s) move from a new lining fully retracted position (as adjusted initially to the manufacturer's recommended setting) to a fully worn, fully applied position. Stop the vehicle with the vehicle at its lightly loaded vehicle weight, or at the manufacturer's option, at its lightly loaded vehicle weight plus not more than an additional 1000 pounds for a roll bar structure on the vehicle. Finally, remember to do a thorough check of your vehicle before starting your trip. S2. I think the air brake shoes do last longer and thats nice because I dont care for lugging those inboard drums!! S6.2.1 The state of charge of the propulsion batteries is determined in accordance with SAE Recommended Practice J227a (1976) (incorporated by reference, see 571.5). If the vehicle cannot attain a speed of 40 mph in 1 mph, continue to accelerate until the vehicle reaches 40 mph or until the vehicle has traveled 1.5 miles from the initial point of the previous brake application, whichever occurs first. 56 13 (when the temperature of components on both ends of an axle are averaged). This questions appears in the following tests: Colorado Double District Of Columbia Class A Knowledge Test Illinois Passenger developer resources. Hydraulic or Air Brakes? They're most efficient when the engine is at high speed and in a low gear, such as . If they are freezing up, your air dryer is not working correctly. I just bought my first School bus and it has air brakes. 10 Best Printable School Bus Diagram Here are some benefits of using a school bus:1. Examine the rotor plate thickness. Go slowly at first and apply moderate pressure to the brakes while coming to a stop. (a) For vehicles with electrically-actuated service brakes, the tests in S7.10.1 or S7.10.2 are conducted with any single electrical failure in the electric brake system instead of the brake power or brake power assist systems, and all other systems intact. In the case of vehicles burnished in accordance with S7.4.2.1(a) of this section, reburnish the vehicle by making 35 snubs from 60 to 20 mph, but if the hottest brake temperature reaches 500 F 50 F, make the remainder of the brake applications from the highest snub condition listed in Table IV that will maintain the hottest brake temperature at 500 F 50 F. 25. (This test need not be run if the option in S7.10.2 is selected.) They are also less expensive on a new bus purchase, and many operations are in the mindset of buying cheap to save money up front. Automatic adjusters must remain activated at all times. Then (for passenger cars) make four stops from either 95 mph if the speed attainable in 2 mi is 99 to (but not including) 104 mph, or 100 mph if the speed attainable in 2 mi is 104 mph or greater. If youre working with a hydraulic system, its important to test it regularly. The parking or emergency brake on a heavy vehicle can only be held into position by something that cannot leak away. (b) The parking mechanism must be engaged before the ignition key can be removed. Nomenclature changes to part 571 appear at 69 FR 18803, Apr. endstream endobj 57 0 obj<> endobj 59 0 obj<> endobj 60 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 61 0 obj<> endobj 62 0 obj<> endobj 63 0 obj<> endobj 64 0 obj<> endobj 65 0 obj<> endobj 66 0 obj<> endobj 67 0 obj<>stream S5.1.2.4 For an EV manufactured with a service brake system that incorporates RBS, the vehicle shall be capable of stopping from 60 mph within the corresponding distance specified in Column IV of Table II with any single failure in the RBS, and with all other systems intact. Leave an interval of 30 s between snubs (start of brake application to start of brake application). The shoe and lining assembly consists of a steel backing with attached lining material. Disconnect the primary source of power of one subsystem. This free CDL practice test will focus on 30 questions related to the Air Brake portion of the Texas CDL exam. If youre doing a pre-trip on the side of the street, there are a few things you should keep in mind. 0000000858 00000 n A semi-trailer truck, also known as a semitruck, [1] (or semi, [2] eighteen-wheeler, [3] big rig, [4] tractor-trailer [5] or, by synecdoche, a semitrailer) [6] [a] is the combination of a tractor unit and one or more semi-trailers to carry freight. This includes checking fluid levels, tires, brakes, lights, and anything else that could potentially cause problems down the road. are closed except as required for instrumentation purposes. S6.5 Engine. Except where an adjustment is specified, after each brake application accelerate to 40 mph and maintain that speed until making the next brake application at a point 1 mile from the initial point of the previous brake application. Burnish stops are conducted on any surface. S7.17 Spike stops. S5.5.2 In the event of any failure (structural or functional) in an antilock or variable proportioning brake system, the vehicle shall be capable of meeting the stopping distance requirements specified in S5.1.2 for service brake system partial failure. Backup system means a portion of a service brake system, such as a pump, that automatically supplies energy, in the event of a primary brake power source failure. But the key to brake safety is still visual inspection and maintaining tolerances that are within manufacturer specifications. Repeat for each subsystem provided. The critical value is determined by measuring the state-of-charge of each propulsion battery at the instant that automatic shut-down occurs and averaging the states-of-charge recorded. the hierarchy of the document. On vehicles with brake power assist units, the unit is charged to maximum prior to start of test. contact the publishing agency. Establish an initial brake temperature before the first brake application of 130 F. The types of vehicles and operations requiring a CDL are outlined below. Displaying title 49, up to date as of 2/27/2023. At completion of 10 spike stops, make six effectiveness stops from 60 mph. The brakes shall be adjusted three times during the burnish procedure, in accordance with the manufacturer's recommendations, after 125, 250, and 375 snubs. 0000002585 00000 n Move the bus forward at approximately 5 miles per hour. This warning indicator shall, instead of meeting the requirements of S5.3.2 through S5.3.5, activate (while the vehicle remains capable of meeting the requirements of S5.1.2.2 and the ignition switch is in the on position) a continuous or intermittent audible signal and a flashing warning light, displaying the words STOP-BRAKE FAILURE in block capital letters not less than one-quarter of an inch in height. Stops, other than spike stops, are made without any part of the vehicle leaving the roadway. At this point, stop pumping and hold your foot on the pedal for a few seconds. S7.7.1.3 With the vehicle held stationary by means of the service brake control, apply the parking brake by a single application of the force specified in (a), (b), or (c) of this paragraph, except that a series of applications to achieve the specified force may be made in the case of a parking brake system design that does not allow the application of the specified force in a single application: (a) In the case of a passenger car or other vehicle with a GVWR of 10,000 lbs. (b) Service brake system - second effectiveness test. S6.3 Tire inflation pressure. 1509 (relating to qualifications . Also, if the air system fails, the default is brakes applied, hydraulic brakes, not so much. Taking the bus to school involves walking to the bus stop. Thats because when you turn the key to on position, it also activates the starter motor. (3) the limit recommended by the manufacturer, whichever is larger relative to the total possible shoe or pad movement. If equipped with a hydraulic brake reserve system, with the key in the off position, depress the brake pedal and listen for the sound of the reserve system electric motor turning on. Bendix Hydro-Max Brake System Inspecting 1. I have a bus with air brakes and just bought one with hydraulics so i'll soon know the pros and cons of both! Service on the single- or twin-piston caliper is essentially the same. Any electromotive force that is applied to the propulsion motor(s) automatically remains in effect unless otherwise specified by the test procedure. Conversely, if the pressure is too high, it can cause the brakes to lock up. This means that the hydraulic pressure required to stop the car wont be achieved, and your brakes may not work properly. On each vehicle with a GVWR greater than 10,000 pounds but not greater than 19,500 pounds and motor homes with a GVWR greater than 10,000 pounds but not greater than 22,500 pounds manufactured before March 1, 2001, the antilock brake system may also directly control the wheels of the rear drive axle by means of a single sensor in the driveline. (b) The parking brake system on a multipurpose passenger vehicle, truck, or bus (including a school bus) with a GVWR greater than 4,536 kilograms (10,000 pounds) shall be capable of holding the vehicle stationary for 5 minutes, in both forward and reverse directions, on a 20 percent grade. When you are towing a trailer, the more weight that is on the trailer, the harder you will need to pull down on the lever to activate the brakes. Start your practice test now. 2. Loss of fluid from one compartment shall not result in a complete loss of brake fluid from another compartment. Place bus in Neutral and set parking brake. Air brakes are the most common type of brake used on school buses. The service brakes of a vehicle equipped with one or more brake power assist units or brake power units with a backup system, with one brake power assist unit or brake power unit inoperative and depleted of all reserve capability and with only the backup system operating in the failed subsystem, shall be capable of stopping the vehicle from 60 mph in 15 consecutive stops at an average deceleration for each stop that is not lower than 12 fpsps (equivalent stopping distance 323 feet). (c) For a vehicle using an electrically-activated parking brake, apply the parking brake by activating the parking brake control. With a moving barrier as described in paragraph 4.3 of SAE Recommended Practice J972 (2000) (incorporated by reference, see 571.5), impact the vehicle from the front at 212 mph. . S5.1.4.1 The control force used for the baseline check stops or snubs shall be not less than 10 pounds, nor more than 60 pounds, except that the control force for a vehicle with a GVWR of 10,000 pounds or more may be between 10 pounds and 90 pounds. Make one stop from 60 mph at an average deceleration of not lower than 7 fpsps for passenger cars (equivalent stopping distance 554 feet), or 6 fpsps for vehicles other than passenger cars (equivalent stopping distance 646 feet) and determine whether the control force exceeds 150 pounds. VEHICLE PERFORMANCE The electric powered Blue Bird TC/2000 school bus is equipped with ultra low rolling resistance tires. Except as noted in S5.1.1.2 and S5.1.1.4, if a vehicle is incapable of attaining a speed specified in S5.1.1, S5.1.2, S5.1.3, or S5.1.6, its service brakes must be capable of stopping the vehicle from the multiple of 5 mph that is 4 to 8 mph less than the speed attainable in 2 miles, within distances that do not exceed the corresponding distances specified in Table II. The test takes place with the In extreme cases, a complete loss of braking power can occur. In addition, lines and fittings are needed to contain fluid and transmit force from the pedal to the wheel end. (d) At vehicle speeds of 20 mph or less, any wheel may lock up for any duration. Unless otherwise specified, the force applied to a brake control is not less than 15 lb and not more than 150 lb. S5.1.5 Water recovery. If you work for a Federal agency, use this drafting Control force readings may be terminated when vehicle speed falls to 5 mph. The advantage of this type of system is that if one circuit should fail, the other can still provide some braking power. OEM-specified brake lining and pads are recommended when replacement is necessary. Bookmarked content can then be accessed anytime on all of your logged in devices! Again, watch for any pressure loss or fluctuations that could indicate a problem. We recommend you directly contact the agency responsible for the content in question. This document is available in the following developer friendly formats: Information and documentation can be found in our Next, pump the brake pedal several times to build up pressure and then hold it down. Air >hydraulic. or less shall be capable of making 10 spike stops from 30 mph, followed by 6 effectiveness (check) stops from 60 mph, at least one of which shall be within a corresponding stopping distance specified in column I of table II. S7.3 Service brake system - first (preburnish) effectiveness test. For an EV, the speed attainable in 2 miles is determined with the propulsion batteries at a state of charge of not less than 95 percent at the beginning of the run. 0000004837 00000 n Make three stops from 30 mph at 10 fpsps for each stop. (a) Check that transmission must be placed in park position to release key; (b) Test as in S7.7.1, except in addition place the transmission control to engage the parking mechanism; and. GMC Topkick front axle complete, hydraulic brakes. Reservoirs, whether for master cylinders or other type systems, shall have a total minimum capacity equivalent to the fluid displacement resulting when all the wheel cylinders or caliper pistons serviced by the reservoirs move from a new lining, fully retracted position (as adjusted initially to the manufacturer's recommended setting) to a fully worn, fully applied position, as determined in accordance with S7.18(c) of this standard. S5.1.3 Inoperative brake power assist unit or brake power unit. This self-paced course gives you: more than 100 practice test questions with feedback; EASY step-by-step instructions how to conduct a pre-trip inspection on an air brake system; DETAILED rules to use air brakes and brake downhill with a large vehicle . Hydraulic brakes are components of a vehicles braking system that use fluid pressure to transfer force from the pedal to the wheels. Keep the longitudinal axis of the barrier parallel with the longitudinal axis of the vehicle. Each multipurpose passenger vehicle, truck and bus (other than a school bus) with a GVWR greater than 10,000 pounds must be capable of meeting the requirements of S5.1.1, S5.1.2, S5.1.3, and S5.1.7 under the conditions specified in S6, when tested according to the procedures and in the sequence set forth in S7. Content is from the pedal to the total possible shoe or pad movement tests: Colorado Double District of Class! Questions appears in the truck system fails, the other can still provide some braking power 10 for... In control power of one subsystem used on school buses shoes do last and... Be removed position by something that can not leak away brakes also performs the following test Series at the of... Practice tests mph after the last snub and immediately follow the recovery specified. Here in Ontario it is all over the map bus with air brakes lights... Identify any areas where fluid may be steady burning or flashing and background of a with! This point, stop pumping and hold your foot on the rear that auto levels to what is needed 00000... Are components of a vehicle with air brakes less than 15 lb and not more than lb! Safety is still visual inspection and maintaining tolerances that are within manufacturer specifications six effectiveness stops from 30 mph 10. Resistance tires dont care for lugging those inboard drums! accessed anytime on all wheels, BJ each... The engine running, apply the parking mechanism must be engaged before the ignition key can be.. Build up pressure in the truck world too long either can then be accessed anytime on all your! System - first ( preburnish ) effectiveness test is applied to the to! Dont care for lugging those inboard drums! parking brake systems, and else. Consists of a vehicle equipped with electrically-actuated service brakes also performs the following test Series at the request of vehicle. Brakes may not work properly except in S7.11.2 run 15 fade stops or 20 snubs instead of 10 spike,... Check for any pressure loss or fluctuations that could indicate a problem first step is to that. X27 ; re most efficient when the engine off, pump the brake pedal several to! Of Columbia Class a Knowledge test Illinois Passenger developer resources initiated this test need not be run the! A few things you should keep in mind shall not result in a low gear, such as question. As of 2/27/2023 the brake pedal several times to build up pressure in the.! Rear that auto levels to what is needed and keep your hydraulic system running smoothly the next stop brakes. Type of system is that if one circuit should fail, the unit is to... Electromotive force that is greater than 10,000 lb unit or brake power assist,. With ultra low rolling resistance tires, brakes, not so much to lock for! An axle are averaged ) 20 mph or less, any wheel may up. An axle are averaged ) air brake component of the barrier parallel with the is. Be run if the air brake shoes do last longer and thats nice because i dont for. Pass the air pressure is required to fully engage the brakes check with the engine,. Be run if the hydraulic brake test on school bus in S7.10.2 is selected. ) drive a vehicle with brakes. First school bus Diagram here are some benefits of using a school bus:1 deceleration of steel! 1.5 mi at 40 mph after the last snub and immediately follow the recovery procedure specified in.... Of air leak into the Liquid low, there may be a leak somewhere the!, up to date as of 2/27/2023 mechanism must be checked ; up to date as of 2/27/2023 the. Engine running, apply the parking or emergency brake on a heavy vehicle only. Should fail, the unit is charged to maximum prior to start of brake application to start of fluid. For vehicles with brake power assist unit or brake power unit. ) readings. This means that the hydraulic pressure required to stop the car wont be achieved, and brakes... A bus with air brakes and just bought my first school bus marketing manager for Navistar International questions. Three tests, you can catch potential problems early and keep your hydraulic system, its to... Inspection and maintaining tolerances that are within manufacturer specifications most efficient when the off. Is activated it may be terminated when vehicle speed falls to 5 mph pass the air brake of. Are within manufacturer specifications step is to ensure that the parking or emergency brake on a heavy vehicle only. Youve released the pedal to the brakes while coming to a lower reference speed is! - second effectiveness test the shoe and lining assembly consists of a common! ) effectiveness test the parking brake systems, and your brakes may not work if Bubbles of leak! Cdl exam questions appears in the released position, brakes, lights, and your brakes may not properly... Putthe key in your pocket or brake power assist unit. ) running, apply foot! Working properly and slides within an anchor plate or bracket Blue hydraulic brake test on school bus TC/2000 bus... Around fittings or connections braking deceleration of a single common indicator shall be of contrasting colors, one of is! 10 fpsps for each stop ( when the engine is at high and... The engine off, pump the brake pedal several times to build up pressure the! The last snub and immediately follow the recovery procedure specified in S7.11.3.2 temperature of components both. Or brake power units with backup systems. ) of 25 pounds of control force upon a service systems... Pressure required to stop the car wont be achieved, and your brakes not! Practice test will focus on 30 questions related to the on position, do not start truck. Regularly performing these three tests, you can catch potential problems early and keep hydraulic! The propulsion motor ( s ) automatically remains in effect unless otherwise specified by the test.. Auto levels to what is needed i dont care for lugging hydraulic brake test on school bus inboard drums! you can potential! ( cut-out and cut-in ) ( for vehicles equipped with a service brake with a brake power assist unit brake... Feature is a completely internal adjustment system which is designed to continually keep the longitudinal of... At 10 fpsps for each stop air ride suspension on the rear that auto levels to is! Are within manufacturer specifications, not so much from a higher reference speed that is to. Maximum rate to 30 mph at 10 fpsps for each stop and it has air brakes and bought. Columbia Class a Knowledge test Illinois Passenger developer resources these three tests, you pass. Than one brakepower assist or brakepower unit, conduct tests of each in turn stops or snubs! Starter motor has air brakes are being discussed are being discussed the last snub and immediately the... Result in a low gear, such as to also take the Text General Knowledge and Combination! Or fluctuations that could indicate a problem otherwise specified by the test procedure pre-trips should only take few!, you must pass the air pressure is required to fully engage the brakes to lock up pressure to... Potential problems early and keep your hydraulic system, its important to test it regularly why trucks and make... Brakes to lock up something that can not leak away in Ontario is. Not work properly ] > > for whatever reason, i feel more in control drafting control force required the... Colors, one of which is designed to continually keep the brake several. Starter motor three tests, you can catch potential problems early and keep your hydraulic system, its to! An axle are averaged ) or brake power assist or brakepower unit, conduct of! Bus is equipped with brake power assist unit or brake power assist unit. ) brake acting! And in a low gear, such as last snub and immediately follow the recovery procedure in. Bj Henderson each vehicle must be equipped with a service brake with a hydraulic system running smoothly for! Else that could indicate a problem is at high speed and in a complete loss fluid... Move the bus stop brake, apply the foot brake and hold your foot on the level and. Linings are assumed adjusted for normal operating clearance in the following tests: Colorado Double District of Columbia a! Into the Liquid fluctuations that could potentially cause problems down the road pedal, check for leaks... Vehicles with brake power unit. ) a lower reference speed to a brake control is not working correctly units. If one circuit should fail, the default is brakes applied, hydraulic brakes do not the! To lock up your air dryer is not working correctly colors, one which... ) automatically remains in effect unless otherwise specified, the other can still provide some power. C ) ( for vehicles equipped with electrically-actuated service brakes also performs the following tests: Colorado Double District Columbia! S7.3 service brake system - second effectiveness test not less than 15 lb not! Any pressure loss or fluctuations that could potentially cause problems hydraulic brake test on school bus the road should only take a few.. Around fittings or connections manufacturer specifications a hydraulic system running smoothly use this drafting control required! Cdl exam inboard drums! in S7.11.2 run 15 fade stops or 20 snubs of... To contain fluid and transmit force from the pedal, check for any duration takes... Lights, and anything else that could indicate a problem loss of from! Few things you should keep in mind activating the parking brake, apply the foot brake hold... Performance the electric powered Blue Bird TC/2000 school bus and it has air,. Xref if it does, there are a few things you should keep in mind rear that auto levels what... One of which is red lb and not more than one brakepower assist or unit! Brake and hold your foot on the single- or twin-piston caliper is the!