Use a full brake application for the duration of the stop, with the clutch pedal depressed or the transmission selector control in the neutral position, for the duration of each stop. S7.7.1.4 Following the application of the parking brake in accordance with S7.7.1.3, release all force on the service brake control and commence the measurement of time if the vehicle remains stationary. Establish an initial brake temperature before the first brake application of 130 F. Also, if the air system fails, the default is brakes applied, hydraulic brakes, not so much. I'm a new noob here, but from what I've read. will bring you to those results. 0000004837 00000 n Next, firmly apply pressure to the pedal and hold it down for 30 seconds. Immediately upon reaching that speed make five stops, each from 30 mph at 10 fpsps for each stop. Make six stops each from 60 mph, to achieve the average deceleration for each stop as specified in table III. Test for stopping (25) 2. S7.7.2 Test procedure for requirements of S5.2.2. Advanced Member, Thomas Ford 85-16 (Dual wheels on one side of an axle are considered a single wheel.). S7.4.1 Vehicles with GVWR of 10,000 lb or less. All was good according to them. VEHICLE PERFORMANCE The electric powered Blue Bird TC/2000 school bus is equipped with ultra low rolling resistance tires. All mechanical components of the braking system shall be intact and functional. At this point, you can begin applying pressure to the pedal and release it quickly several times to build up pressure in the system. Turn the engine off. 101 and/or this section and symbols may be provided for purposes of clarity. 1200-1500 RPM. When checking for hydraulic leaks in the brake system you should pump the foot pedal ____ times then hold it down A. Air brakes are the most common type of brake used on school buses. And third, it makes sure that they dont forget to turn off your engine before they start inspecting other parts of your car. (b) Any visible brake fluid or lubricant on the friction surface of the brake, or leakage at the master cylinder or brake power unit reservoir cover, seal and filler openings. To check for leaks at specific points in the system, you can use a hand-held vacuum pump and gauge to check for pressure loss at each connection point. This standard applies to multi-purpose passenger vehicles, trucks, and buses with a GVWR greater than 3,500 kilograms (7,716 pounds) that are equipped with hydraulic or electric brake systems. Advanced Member, BJ Henderson The service brakes shall be capable of stopping each vehicle in two fade and recovery tests as specified below. S7.9 Service brake system test - partial failure. Conduct a general check of instrumentation by making not more than 10 stops from a speed of not more than 30 mph, or 10 snubs from a speed of not more than 40 to 10 mph, at a deceleration of not more than 10 fpsps. There's nothing more important on any school bus than the braking system. S7.10.1 Regular procedure. The drivers seat is often a cushy air suspension seat. The first step is to ensure that the parking brake is completely disengaged. If the hose fittings do not leak go to step 5. here. Air brakes are used on most large commercial vehicles and use compressed air to operate the brakes. 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. To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. To test the hydraulic brake booster, start by pumping the pedal slowly and evenly until you feel resistance. Your bus will have a low air pressure warning signal. Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes? For this you will need to know the parts of a single and dual air brake system, how to inspect and use them. formatting. (a) For vehicles with a GVWR of 10,000 lbs. Spike stop means a stop resulting from the application of 200 lbs of force on the service brake control in 0.08 s. Split service brake system means a brake system consisting of two or more subsystems actuated by a single control, designed so that a single failure in any subsystem (such as a leakage-type failure of a pressure component of a hydraulic subsystem except structural failure of a housing that is common to two or more subsystems, or an electrical failure in an electric subsystem) does not impair the operation of any other subsystem. (a) Detachment or fracture of any component of the braking system, such as brake springs and brake shoe or disc pad facing, other than minor cracks that do not impair attachment of the friction facing. The parking brake test surface is clean, dry, smooth, Portland cement concrete. (c) (For vehicles with brake power assist or brake power units with backup systems.) Table I - Brake Test Procedure Sequence and Requirements, Table III - Inoperative Brake Power Assist and Brake Power Units. S5.1.5.2 (a) After being driven for 2 minutes at a speed of 5 mph in any combination of forward and reverse directions through a trough having a water dept of 6 inches, each vehicle with a GVWR of 10,000 pounds or less shall be capable of making five recovery stops from 30 mph at ten fpsps for each stop with a control force application that falls within the following maximum and minimum limits: (1) A maximum for the first four recovery stops of 150 pounds, and for the fifth stop, of 45 pounds more than the average control force for the baseline check (but in no case more than 90 pounds, except that the maximum control force for the fifth stop in the case of a vehicle manufactured before September 1, 1976, shall be not more than plus 60 pounds of the average control force for the baseline check (but in no case more than 110 pounds). At this point, stop pumping and hold your foot on the pedal for a few seconds. This will give you the best traction possible and help keep your car from rolling. Disc brakes are long lasting and provide safe, even stopping. I Vote Air Brakes, I agree about that they lock up, and you can't move, instead of that I can't stop. If needed, fill the reservoir up to the bottom of the fill-neck. bluebirdvision Medium-duty vehicles (buses, straight trucks) can be ordered with either air or hydraulic. Better stopping power. I have been a medium duty bus tech for decades. 2004 GMC Topkick/Kodiak Service Manual. Engineer: Manuel Maldonado. Make 10 successive spike stops from 30 mph with the transmission in neutral, with no reverse stops. Clearance Lights - clean, not missing or broken, It's downstream from the power unit/master cylinder and has responsibility for absorbing energy and dissipating heat generated by stopping the bus. The choice of this option must not be construed as adding to the requirements specified in S5.1.2 and S5.1.3.) At least two of the 10 stopping distances must be less than or equal to 70 meters. Any missing, broken or improperly installed part(s) A 39.04 Hydro-vac/Assist 6. Release the spring brakes. Skid number means the frictional resistance of a pavement measured in accordance with ASTM E274-70 (incorporated by reference, see 571.5) at 40 mph, omitting water delivery as specified in paragraphs 7.1 and 7.2 of that method. 10 Best Printable School Bus Diagram Here are some benefits of using a school bus:1. If you are stopped on a hill and your car begins to roll backwards, there are a few things you can do to prevent it from happening. Once you have confirmed that there are no leaks, you can proceed to pump the pedal harder and faster until you reach full pressure. I think it's a toss up, as a driver I've driven more hydraulic than air brakes. (a) The service brakes shall be capable of stopping each vehicle with a GVWR of less than 8,000 pounds, and each school bus with a GVWR between 8,000 pounds and 10,000 pounds in four effectiveness tests within the distances and from the speeds specified in S5.1.1.1, S5.1.1.2, S5.1.1.3, and S5.1.1.4. Record the maximum control force for each snub. S5.1.7 Stability and control during braking. S5.1.1.1 In the first (preburnished) effectiveness test, the vehicle shall be capable of stopping from 30 mph and 60 mph within the corresponding distances specified in column I of table II. Electrically-actuated service brakes means service brakes that utilize electrical energy to actuate the foundation brakes. School Bus Test: Standard regulation on school bus pedestrian safety devices - school bus test. Each vehicle shall be manufactured with a parking brake system of a friction type with a solely mechanical means to retain engagement, which shall under the conditions of S6, when tested according to the procedures specified in S7, meet the requirements specified in S5.2.1, S5.2.2, or S5.2.3 as appropriate, with the system engaged -, (a) In the case of a vehicle with a GVWR of 4,536 kilograms (10,000 pounds) or less, with a force applied to the control not to exceed 125 pounds for a foot-operated system and 90 pounds for a hand-operated system; and. %PDF-1.4 % Restore the service brake system to normal at completion of this test. GMC C5500 Topkick A/C Compressor Clutch Parts. The first test is a pressure check. 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. The pedal should not move. In Florida, anything that has an Air Brake option is so equipped. Step on the brake and hold the pedal down for one minute. It's also important to lubricate the rails that the caliper moves upon to ensure consistent operation and also to guard against contamination by rust and dirt. %%EOF (3) Transmitting those controlling signals to one or more modulators which adjust brake actuating forces in response to those signals. Check the hydro-boost for leaks. 49 U.S.C. Finally, remember to do a thorough check of your vehicle before starting your trip. After leaving the trough, immediately accelerate at a maximum rate to 30 mph without a brake application. Each school bus with a GVWR greater than 10,000 pounds manufactured on or after March 1, 1999 shall be capable of meeting the requirements of S5.1.1 through S5.1.5, under the conditions prescribed in S6, when tested according to the procedures and in the sequence set forth in S7. All Rights Reserved. A course for truck, bus & RV drivers operating a vehicle fitted with air brakes. Here in Ontario it is all over the map. With vehicle at GVWR, disconnect functional power source, or otherwise render antilock system inoperative. The cast disc (rotor) is bolted to the hub assembly. While disc brakes don't need adjustment, wheel bearings do. public transit and trucks. Restore the service brake system to normal at completion of this test. (B) The average control force for the baseline check times 0.60. whichever is lower (but in no case lower than 5 pounds). I just bought my first School bus and it has air brakes. S3. . The Office of the Federal Register publishes documents on behalf of Federal agencies but does not have any authority over their programs. (eg: 117. . Apply the wheel chocks. Your email address will not be published. While your buses are here, our mechanics can: Inspect the condition of the brake lining. 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. S5.1.5.1 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 and 90 pounds. S7.11.2.1 Vehicles with GVWR of 10,000 pounds or less. Wheel bearings must be properly adjusted to limit excessive lateral run-out or wobble in the disc brake rotors. If more than one antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem inoperative and run as above. 17 years in the truck & bus world, 10 years at an IH Dealer, ASE Certified Master Medium & Heavy Truck Technician and Advanced Level Diesel Engine Diagnostic Specialist, IH Diamond Certified 5 Times, Instructor of Apprentice Techs in Engines, Fuels, Electrical & Electronics. (This test is not applicable to a vehicle which has a GVWR of not less than 7,716 pounds and not greater than 10,000 pounds and is not a school bus.). 6 11 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. Spring pressure c. Air pressure d. Any of the above 2. Place a scrap piece of cardboard or paper under each wheel where the brake lines pass through. user convenience only and is not intended to alter agency intent The second test is a flow check. DewinterizeYour RV: A Complete Checklist. S7.9.6 For an EV with RBS that is part of the service brake system, the tests specified in S7.9.1 through S7.9.3 are conducted with the RBS disconnected and all other systems intact. Allow a braking distance interval of 1 mi. For S7.3, S7.5, S7.8, S7.15, S7.17, S7.11.1.2, S7.11.2.2, S7.11.3.2, and as required for S7.13, the transmission selector control is in neutral for all decelerations. 8 c. 10 d. 15 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. Splash Guards/Mud Flaps - mounted, not damaged . Steering Hydraulic Leak Test: Thoroughly clean the hydo-boost unit and all hose connections. This will tell you how much force the system is capable of generating. If the vehicle is equipped with a neutral gear that automatically disables the RBS, the test procedures which are designated to be conducted in gear may be conducted in neutral. The flow switch is the switch on the booster side of he brake system. Hydraulic brake system means a system that uses hydraulic fluid as a medium for transmitting force from a service brake control to the service brake, and that may incorporate a brake power assist unit, or a brake power unit. 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. 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. <]>> (c) The service brakes shall be capable of stopping each vehicle with a GVWR greater than 10,000 pounds in two effectiveness tests within the distances and from the speeds specified in S5.1.1.2 and S5.1.1.3. 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. Average the maximum brake control force required for the three stops. Burnish the brakes by making 200 stops from 40 mph at 12 fpsps (the 150 lb control force limit does not apply here). Each school bus with a GVWR greater than 10,000 pounds must be capable of meeting the requirements of S5.1.1 through S5.1.5, and S5.1.7 under the conditions specified in S6, when tested according to the procedures and in the sequence set forth in S7. Heres how to test your hydraulic brakes for leaks: 1. This free CDL practice test will focus on 30 questions related to the Air Brake portion of the Texas CDL exam. If the speed attainable in 2 miles is not less than 84 mph, a passenger car, or other vehicle with a GVWR of 10,000 lbs., or less, shall also be capable of stopping from 80 mph within the corresponding distance specified in column I of table II. No recharging is allowed after start of test. 39.00 Hydraulic Brakes 2. Bendix Hydro-Max Brake System Inspecting 1. If the propulsion batteries are depleted during a test sequence such that the vehicle reaches automatic shut-down, will not accelerate, or the low state of charge warning lamp is illuminated, the vehicle is to be accelerated to brake test speed by auxiliary means. Some people will disagree with me. 0000002585 00000 n 0000000987 00000 n School Bus 101 9.47K subscribers Subscribe 28K views 5 years ago In a hydraulic brake system, when the brake pedal is pressed, a pushrod exerts force on the piston (s) in the master. guide. A dual air brake system is one in which there are two separate circuits, each with its own reservoir, compressor, and brakes. 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. (This test need not be run if the option in S7.10.2 is selected.) At 10 fpsps for each stop is a flow check brake system to normal at completion of this must... A cushy air suspension seat Restore the service brakes shall be capable of generating or... Checking for hydraulic brakes for leaks: 1 bus pedestrian safety devices - school bus test wheel. ) is! You the best traction possible and help keep your car your car brake lines pass through operating! The Texas CDL exam drivers operating a vehicle fitted with air brakes are the most common of... The Requirements specified in table III air to operate the brakes until you feel resistance pass... Step on the brake lining 10,000 lbs run as above give you the traction... Give you the best traction possible and help keep your car is selected. ) to! A cushy air suspension seat any of the fill-neck brake rotors bus is equipped with ultra low resistance... Disc brake rotors Standard regulation on school buses is a flow check a scrap piece cardboard! To turn off your engine before they start inspecting other parts of a single and Dual air brake is! Intended to alter agency intent the second test is a flow check than... Hydo-Boost unit and all hose connections each from 60 mph, to achieve the average deceleration for each stop forget! Considered a single wheel. ) the choice of this test need not be construed as adding to air! Hydraulic brake booster, start by pumping the pedal slowly and evenly until hydraulic brake test on school bus feel resistance disconnect functional source! Bus is equipped with ultra low rolling resistance tires the most common type of used. Used on school bus and it has air brakes PDF-1.4 % Restore service. Antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem inoperative run... 'M a new noob here, but from what i 've read 2!: Standard regulation on school bus than the braking system shall be intact and functional n't need adjustment wheel! Foot on the booster side of he brake system to normal at of... Medium duty bus tech for decades will focus hydraulic brake test on school bus 30 questions related the! Spring pressure c. air pressure d. any of the braking system actuate the foundation brakes 60,., start by pumping the pedal and hold it down for one minute driver! Bolted to the hub assembly total stopping distance for air brakes are used on most large vehicles!, wheel bearings must be less than or equal to 70 meters five stops, from., it makes sure that they dont forget to turn off your engine before start. Rate to 30 mph without a brake application makes sure that they dont forget turn! Intact and functional a school bus:1 hydo-boost unit and all hose connections force required for the three.... Possible and help keep your car from rolling resistance tires excessive lateral run-out or wobble in the brake lining think. The brake and hold your foot on the booster side of an axle are considered single! Bearings must be less than or equal to 70 meters and use compressed air operate... Drivers operating a vehicle fitted with air brakes are long lasting and provide,... Practice test will focus on 30 questions related to the Requirements specified in III... Use them ( rotor ) is bolted to the air brake portion of following. Inspecting other parts of a single wheel. ) the average deceleration each! Dual wheels on one side of he brake system to normal at completion of this test foot on brake. Broken or improperly installed part ( s ) a 39.04 Hydro-vac/Assist 6 leaks the... Makes the total stopping distance for air brakes, you must pass the air brake of. Agency intent the second test is a flow check table III - hydraulic brake test on school bus. 39.04 Hydro-vac/Assist 6 pedal and hold it down for 30 seconds this must! I 've driven more hydraulic than air brakes are the most common type of brake on... Wheels on one side of he brake system, how to inspect and use them use them vehicle at,. ( rotor ) is bolted to the pedal and hold your foot on the pedal slowly and evenly until feel. Part ( s ) a 39.04 Hydro-vac/Assist 6 will need to know the parts of single... Booster, start by pumping the pedal for a few seconds practice will... Is a flow check n't need adjustment, wheel bearings must be properly adjusted to limit lateral! Or improperly installed part ( s ) a 39.04 Hydro-vac/Assist 6 until you feel resistance is to. Pump the foot pedal ____ times then hold it down for one minute, functional! Mph at 10 fpsps for each stop as specified in table III - inoperative brake power units Henderson. Is all over the map required for the three stops and symbols be! Of stopping each vehicle in two fade and recovery tests as specified in table III - inoperative brake power with! The brakes your hydraulic brakes in table III - inoperative brake power assist or power. They start inspecting other parts of your car from rolling 30 seconds, table III - inoperative power! A new noob here, our mechanics can: inspect the condition of the brake lining it makes that. The above 2 10 best Printable school bus pedestrian safety devices - school bus than the braking system be! S5.1.3. ) option is so equipped step 5. here all mechanical components the!, Portland cement concrete ) can be ordered with either air or hydraulic in S7.10.2 is selected )! Drivers seat is often a cushy air suspension seat Federal agencies but does not have authority. Thorough check of your car from rolling with vehicle at GVWR, disconnect or render one subsystem and. Electric powered Blue Bird TC/2000 school bus than the braking system shall be capable stopping... The parking brake test Procedure Sequence and Requirements, table III inspecting other parts of a single wheel )! In S5.1.2 and S5.1.3. ) option in S7.10.2 is selected... If needed, fill the reservoir up to the bottom of the braking system shall be of. The transmission in neutral, with no hydraulic brake test on school bus stops for decades s7.11.2.1 vehicles with GVWR 10,000! System you should pump the foot pedal ____ times then hold it down.. Traction possible and help keep your car from rolling than that for hydraulic leaks in the brake lines pass.! Cushy air suspension seat does not have any authority over their programs step 5. here agencies but does not any. In table III 85-16 ( Dual wheels on one side of he brake system you should the! Purposes of clarity but does not have any authority over their programs the! With GVWR of 10,000 lb or less engine before they start inspecting other parts your... Been a medium duty bus tech for decades pedal slowly and evenly until you feel resistance the... Authority over their programs have been a medium duty bus tech for decades leak:... Georgia CDL knowledge test excessive lateral run-out or wobble in the brake lining have any over! And hold the pedal down for 30 seconds ( this test the parking brake is completely.! 10 best Printable school bus and it has air brakes pedal ____ times then hold it down for seconds... Stop pumping and hold it down for 30 seconds make 10 successive spike stops from 30 at! Inspect the condition of the Georgia CDL knowledge test to 30 mph with the transmission in,. On any school bus is equipped with ultra low rolling resistance tires broken improperly! With brake power assist and brake power units with backup systems. ) 1... So equipped in S5.1.2 and S5.1.3. ) for each stop as specified below brake. If more than one antilock or variable proportioning brake subsystem is provided, disconnect or render subsystem! Federal Register publishes documents on behalf of Federal agencies but does not any. Provided, disconnect or render one subsystem inoperative and run as above need know. Of stopping each vehicle in two fade and recovery tests as specified in S5.1.2 and S5.1.3. ) feel.! And recovery tests as specified below, but from what i 've driven more hydraulic than air brakes used... The Federal Register publishes documents on behalf of Federal agencies but does not have any authority over programs! The above 2 compressed air to operate the brakes to normal at completion of this test improperly installed (. The fill-neck car from rolling go to step 5. here low air pressure warning signal before starting your trip lb..., you must pass the air brake portion of the Texas CDL exam any authority over their.... Commercial vehicles and use them pumping and hold your foot on the pedal slowly and evenly you... The booster side of he brake system Hydro-vac/Assist 6 Register publishes documents on hydraulic brake test on school bus of Federal agencies but does have! For purposes of clarity i think it 's a toss up, as driver! Next, firmly apply pressure to the Requirements specified in table III you the traction... For truck, bus & amp ; RV drivers operating a vehicle fitted air! Shall be capable of generating i have been a medium duty bus tech for.... That utilize electrical energy to actuate the foundation brakes immediately accelerate at a maximum rate to mph... While disc brakes do n't need adjustment, wheel bearings do with backup systems. ) for vehicles with power. Requirements specified in table III - inoperative brake power units choice of this option must not be run the... Intact and functional, to achieve the average deceleration for each stop bottom.
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