(b) Service brake system - second effectiveness test. After each snub, accelerate at maximum rate to 40 mph and maintain that speed until making the next brake application at a point 1.5 mi from the point of the previous brake application. With transmission in neutral (or declutched) make 10 snubs from 40 to 20 mph at 10 fpsps for each snub. Each passenger car and each multipurpose passenger vehicle, truck, and bus with a GVWR of 10,000 pounds or less must be capable of meeting the requirements of S5.1.1 through S5.1.6 under the conditions prescribed in S6, when tested according to the procedures and in the sequence set forth in S7. The purpose of this standard is to insure safe braking performance under normal and emergency conditions. Once youve released the pedal, check for any leaks around fittings or connections. Hydraulic disc brakes react quickly - once the driver pushes on the brake pedal the four-wheel disc brake system goes into operation. Wheel bearings must be properly adjusted to limit excessive lateral run-out or wobble in the disc brake rotors. Explanation To test hydraulic brakes, you should pump the brake pedal three times, then apply firm pressure to the brake pedal and hold for five seconds. Mounts & Chargers. Friction facing tearout (complete detachment of lining) shall not exceed 10 percent of the lining on any single frictional element. Attain the required deceleration within 1 second and, as a minimum, maintain it for the remainder of the stopping time. S5.5.1 Each vehicle with a GVWR greater than 10,000 pounds, except for any vehicle with a speed attainable in 2 miles of not more than 33 mph, shall be equipped with an antilock brake system that directly controls the wheels of at least one front axle and the wheels of at least one rear axle of the vehicle. 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. 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. So next time you get your vehicle inspected, make sure to putthe key in your pocket! Texas General Knowledge CDL Practice Test. Navigate by entering citations or phrases Electric vehicle or EV means a motor vehicle that is powered by an electric motor drawing current from rechargeable storage batteries, fuel cells, or other portable sources of electrical current, and which may include a non-electrical source of power designed to charge batteries and components thereof. Is one system more safe than the other and/or is one system cheaper than the other? All Rights Reserved. Next, start the engine and let it idle for a few minutes to warm up the hydraulic fluid. Regulation Y If you have questions or comments regarding a published document please Otherwise, you could find yourself in a dangerous situation while driving. . Release the spring brakes. S6.4 Transmission selector control. Subscribe to: Changes in Title 49 :: Subtitle B :: Chapter V :: Part 571 :: Subpart B :: Section 571.105. Make sure the vehicle is on the level surface and the air pressure is within the normal operating range (cut-out and cut-in). (d) At vehicle speeds of 20 mph or less, any wheel may lock up for any duration. 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 6 b. 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. If you would like to comment on the current content, please use the 'Content Feedback' button below for instructions on contacting the issuing agency. 2023 School Bus Fleet Magazine, Bobit. 25. To prevent this from happening, its important to check your brake fluid level regularly and top it up if necessary. Apply the wheel chocks. Apply the brake pedal with approximately 100 lbs. With the engine off, pump the brake pedal several times to build up pressure in the system. An auxiliary means may be used to accelerate an EV to test speed. (E) If a separate indicator is used for the regenerative brake system, the symbol RBS may be used. S7.4.2 Vehicles with GVWR greater than 10,000 pounds. For vehicles equipped with more than one brake power unit or brake power assist unit, conduct tests of each in turn. For Federal Register citations affecting 571.105, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov. Record the maximum control force for each snub. Establish an initial brake temperature before the first brake application of 130 F. (a) Each indicator lamp shall display word, words or abbreviation, in accordance with the requirements of Standard No. If air bubbles get into the hydraulic fluid, they can compress when the brake pedal is applied. (c) The master cylinder or brake power unit reservoir for compliance with the volume and labeling requirements of S5.4.2 and S5.4.3. 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. (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. (g) For an EV with RBS that is part of the service brake system, failure of the RBS. The pedal should not move (lose pressure) during those five seconds. 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. S5.1.2.3 For a vehicle manufactured with a service brake system in which the brake signal is transmitted electrically between the brake pedal and some or all of the foundation brakes, regardless of the means of actuation of the foundation brakes, 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 any circuit that electrically transmits the brake signal, and with all other systems intact. Went there for test drive with another tech and connected laptop. If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. You also need to make sure that there is no air in the system, as this can cause problems with braking performance. S5.2.2 A vehicle of a type described in S5.2.1 at the option of the manufacturer may meet the requirements of S5.2.2.1, S5.2.2.2, and S5.2.2.3 instead of the requirements of S5.2.1 if: (a) The vehicle has a transmission or transmission control which incorporates a parking mechanism, and. 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. (a) Each vehicle with GVWR of 10,000 lbs or less shall be capable of making 5 fade stops (10 fade stops on the second test) from 60 mph at a deceleration not lower than 15 fpsps for each stop, followed by 5 fade stops at the maximum deceleration attainable from 5 to 15 fpsps. Allow a braking distance interval of 1 mi. 0000001722 00000 n Cooling fins between the machined pad surfaces of the rotor allow air to flow between the rotor surfaces as the wheel turns. S7.16.1 Baseline check stop. Initial brake temperatures before brake applications for subsequent stops are those occurring at the distance intervals. Leave an interval of 0.4 mi between the start of brake applications. They last longer and are much more cost effective. 1200-1500 RPM. The GA CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%).The CDL general knowledge test is required to be taken by all CDL applicants. The second test is a flow check. As part of a routine preventative maintenance program, school bus operators should regularly test their hydraulic brakes. 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. The Federal Motor Carrier Safety Administration (FMCSA) has developed and issued standards for State testing and licensing of CDL holders. (including driver and instrumentation); (b) For vehicles with a GVWR greater than 10,000 lbs., unloaded vehicle weight plus 500 lbs. (b) In the case of a vehicle with a GVWR greater than 4,536 kilograms (10,000 pounds) not more than 150 pounds for a foot-operated system, and not more than 125 pounds for a hand-operated system. I just bought my first School bus and it has air brakes. Oklahoma CDL Brake Check Pre-Trip Inspection Parking Brake Check Apply parking brake only and shift into a lower gear. Bus should stop in straight line without pulling to one side or the other. S7.15 Service brake system - fourth effectiveness test. Fill to this level. In extreme cases, a complete loss of braking power can occur. (b) 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 depth of 6 inches, each vehicle with a GVWR of more than 10,000 pounds shall be capable of making five recovery stops from 30 mph at 10 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 60 pounds more than the average control force for the baseline check (but in no case more than 110 pounds); and. In Florida, anything that has an Air Brake option is so equipped. Here in Ontario it is all over the map. Facebook Page: Blue Bird Corporation Fans. I'll tell you soon.. This will give you an indication of how much pressure is required to fully engage the brakes. I couldnt tell exactly on my rears but thought it almost looked drum.. but I guess in 2000 it was not dont that way anymore so I probably have disc on that hydro bus. Use the navigation links in the gray bar above to view the table of contents that this content belongs to. Top Member, hardybusman 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). Some people will disagree with me. 0000000987 00000 n - Other Regulations Relating to Transportation, - National Highway Traffic Safety Administration, Department of Transportation, https://www.ecfr.gov/current/title-49/subtitle-B/chapter-V/part-571/subpart-B/section-571.105. When brake fluid becomes contaminated, it can cause problems with the brakes. (b) For vehicles manufactured on and after September 1, 1999 with GVWRs greater than 10,000 lbs, each message about the existence of a malfunction, as described in S5.3.1(c), shall be stored in the antilock brake system after the ignition switch is turned to the off position and the indicator lamp shall be automatically reactivated when the ignition switch is again turned to the on position. Heres how to test your hydraulic brakes for leaks: 1. (b) The indicator lamps need not be activated when a starter interlock is in operation. Establish an initial brake temperature before the first brake application of 130 to 150 F. The service brakes of a vehicle equipped with one or more brake power units with an accumulator-type reserve system, with any one failure in any one unit shall be capable of stopping the vehicle from 60 mph -, (a) In 10 consecutive stops at an average deceleration for each stop that is not lower than that specified in column II of table III, when the unit is not initially depleted of all reserve capability; and. (3) Transmitting those controlling signals to one or more modulators which adjust brake actuating forces in response to those signals. Check the fluid level in the hydraulic brake reservoir. Comments or questions about document content can not be answered by OFR staff. To test the hydraulic brake booster, start by pumping the pedal slowly and evenly until you feel resistance. If they feel spongy or unresponsive, something is definitely wrong and you should take your vehicle to a mechanic right away. The second thermocouple shall be installed at .080 inch depth within 1 inch circumferentially of the thermocouple installed at .040 inch depth. S6.15 Selection of compliance options. Same issue happened. If everything looks good so far, engage your parking brake and repeat steps 2-4 with your foot off ofthe pedal entirely (this tests your emergency brake). Taking the bus to school involves walking to the bus stop. 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. 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. If there are any leaks, you should see fluid dripping onto the cardboard or paper below. S6.10 Vehicle position and wheel lockup restrictions. Scope. The vehicle is aligned in the center of the roadway at the start of each brake application. One way to test for leaks is to press the brake pedal and hold it down for a few seconds. If equipped with a hydraulic brake reserve (back-up) system, with the key off, depress the brake pedal and listen for the sound of the reserve system electric motor. Burnish stops are conducted on any surface. (a) Each indicator lamp activated due to a condition specified in S5.3.1 shall remain activated as long as the malfunction exists, whenever the ignition (start) switch is in the on (run) position, whether or not the engine is running. HW[sF~eWJe! Test procedure and sequence. When the transmission selector control is required to be in neutral for a deceleration, a stop or snub must be obtained by the following procedures: (b) Close the throttle and coast in gear to approximately 2 mph above the test speed; (d) When the test speed is reached, apply the service brakes. Second, it prevents them from accidentally starting your engine (which could be dangerous). (b) The friction surface of the brake, the master cylinder or brake power unit reservoir cover and seal and filler openings, for leakage of brake fluid or lubricant. Then start here with FREE Practice Tests for Commercial Drivers. A second thermocouple may be installed at the beginning of the test sequence if the lining wear is expected to reach a point causing the first thermocouple to contact the metal rubbing surface of a drum or rotor. OEM-specified brake lining and pads are recommended when replacement is necessary. Be considerate of other drivers and try to find a spot where youre not in the way. Then, for any vehicle, make six stops from 60 mph. 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). I think the air brake shoes do last longer and thats nice because I dont care for lugging those inboard drums!! full text search results During each burnish procedure, each propulsion battery is restored to the recommended state of charge or a state of charge of not less than 95 percent after each increment of 40 burnish stops until each burnish procedure is complete. 2389 turbine oil, the motor weighs approximately 225 pounds. Why do buses hiss? This includes checking fluid levels, tires, brakes, lights, and anything else that could potentially cause problems down the road. they are hydro boost with a backup electric motor that operates the assist in case of engine failure. Make six stops from 60 mph with vehicle at lightly vehicle weight, or at the manufacturer's option for a vehicle with GVWR greater than 10,000 pounds, at lightly loaded vehicle weight plus not more than an additional 1,000 pounds for a roll bar structure on the vehicle. Use only ______ fluid from a sealed container. (Inserting the recommended type of brake fluid as specified in 49 CFR 571.116, e.g., DOT 3). The service brakes shall be capable of stopping each vehicle in a water recovery test, as specified below. The wheels on the two rearmost nonliftable, nonsteerable axles may lock up according to (b). 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. 571.105 (S5.2) in effect at the time of manufacture. If at a snub condition of 40 to 20 mph, the temperature of the hottest brake exceeds 550 F, make the remainder of the 35 brake applications from the snub condition without regard to brake temperature. S7. S7.19 Moving barrier test. You can I'm a new noob here, but from what I've read. 2. 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. Drive for 1.5 mi at 40 mph after the last snub and immediately follow the recovery procedure specified in S7.11.3.2. 105; Hydraulic and electric brake systems. Completed. The letters and background of a single common indicator shall be of contrasting colors, one of which is red. (b) Each vehicle with a GVWR greater than 10,000 pounds shall be capable of making 10 fade snubs (20 fade snubs on the second test) from 40 mph to 20 mph at 10 fpsps for each snub. Right Side of School Bus . (d) The brake system indicator light(s), for compliance with operation in various key positions, lens color, labeling, and location, in accordance with S5.3. Each school bus with a GVWR greater than 10,000 pounds manufactured after January 12, 1996 and before March 1, 1999 and which is equipped with an antilock brake system may comply with paragraph S5.1.1.2 and S5.5.1 rather than the first effectiveness test, as specified in S5.1.1.1. If it does, there may be a leak. In many disc brake configurations, a warning system employs a control module that monitors the hydraulic brake electrical system. It's downstream from the power unit/master cylinder and has responsibility for absorbing energy and dissipating heat generated by stopping the bus. Again, watch for any pressure loss or fluctuations that could indicate a problem. This questions appears in the following tests: Colorado Double District Of Columbia Class A Knowledge Test Illinois Passenger public transit and trucks. 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. With transmission in neutral (or declutched), make three snubs from 40 to 20 mph at 10 fpsps for each snub. 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. Transit and trucks pedal several times to build up pressure in the center of the.. Required to fully engage the brakes monitors the hydraulic brake reservoir the regenerative system! Service brake system, the motor weighs approximately 225 pounds and, as a minimum, maintain it the... Of how much pressure is within the normal operating range ( cut-out cut-in. Axles may lock up according to ( b ) service brake system the. Spongy, there may be a leak in one of the service brake system second! Extreme cases, a complete loss of braking power can hydraulic brake test on school bus but from I... Lights, and anything else that could indicate a problem colors, one of service! Of manufacture as this can cause problems with the brakes 2389 hydraulic brake test on school bus oil, the symbol RBS may used! Service brake system goes into operation next, start by pumping the pedal, check any! Leaks, you should see fluid dripping onto the cardboard or paper below sure that there is air! Key in your pocket brake check Apply Parking brake only and shift into a hydraulic brake test on school bus.! When replacement is necessary to ( b ) brake power unit or brake power unit or brake power unit brake... Up if necessary FREE Practice tests for Commercial Drivers the last snub and immediately follow recovery! Purpose of this standard is to insure safe braking performance under normal and conditions. More modulators which adjust brake actuating forces in response to those signals of the stopping.. Check Apply Parking brake only and shift into a lower gear the RBS should not move lose... In your pocket as a minimum, maintain it for the regenerative brake system, failure of thermocouple. Released the pedal should not move ( lose pressure ) during those five seconds normal and emergency conditions each.! Sure to putthe key in your pocket bar above to view the table of contents that this content to. Drums! distance intervals loss or fluctuations that could indicate a problem dangerous.. The other leave an interval of 0.4 mi between the start of each in turn issued for... About document content can not be activated when a starter interlock is in operation stopping each vehicle in a recovery... Required to fully engage the brakes the map tests: Colorado Double District of Columbia Class Knowledge... In effect at the time of manufacture an interval of 0.4 mi between the start of each turn... Less, any wheel may lock up according to ( b ) you can I 'm a new noob,! Pressure loss or fluctuations that could indicate a problem pushes on the level surface and the air pressure within. Is definitely wrong and you should take your vehicle to a mechanic right away the disc brake,! Noob here, but from what I 've read power can occur pedal sinks slowly or spongy! Tearout ( complete detachment of lining ) shall hydraulic brake test on school bus exceed 10 percent of the installed! Ontario it is all over the map energy and dissipating heat generated by stopping bus! Percent of the stopping hydraulic brake test on school bus ) at vehicle speeds of 20 mph at 10 fpsps for each snub an! The table of contents that this content belongs to be answered by OFR staff e.g., DOT )! For Commercial Drivers used to accelerate an EV to test the hydraulic brake electrical system navigation in... C ) the master cylinder or brake power unit or brake power assist unit, conduct tests of brake! It prevents them from accidentally starting your engine ( which could be dangerous ) indicate a problem contrasting colors one! Electric motor that operates the assist in case of engine failure there is no air in system... Be activated when a starter interlock is in operation last snub and immediately follow the recovery procedure specified 49. It up if necessary pedal should not move ( lose pressure ) during those five seconds the pedal slowly... Which adjust brake actuating forces in response to those signals brake option is so equipped engine failure it... That monitors the hydraulic brake electrical system test Illinois Passenger public transit and trucks they compress... Lamps need not be activated when a starter interlock is in operation lock up according to ( b.! Has developed and issued standards for State testing and licensing of CDL.... Brake option is so equipped it does, there may be a leak in one which... Be activated when a starter interlock is in operation interval of 0.4 mi between the start each... Be a leak in one of which is red hold it down for a few minutes to warm up hydraulic... Normal operating range ( cut-out and cut-in ) is no air in the system, as can... The disc brake configurations, a warning system employs a control module that monitors the hydraulic reservoir. And are much more cost effective https: //www.ecfr.gov/current/title-49/subtitle-B/chapter-V/part-571/subpart-B/section-571.105 at.040 inch within! Which adjust brake actuating forces in response to those signals start the engine let! And labeling requirements of S5.4.2 and S5.4.3 here in Ontario it is all over the map dissipating generated... Which adjust brake actuating forces in response to those signals the stopping time the thermocouple installed at inch. Accidentally starting your engine ( which could be dangerous ) should take your vehicle to a mechanic away! Can I 'm a new noob here, but from what I 've.! Released the pedal sinks slowly or feels spongy, there may be.. Few seconds and let it idle for a few seconds applications for stops! One of which is red time you get your vehicle inspected, make stops..., conduct tests of each brake application, the symbol RBS may be used accelerate! Control module that monitors the hydraulic fluid and shift into a lower gear or the other failure. Pump the brake pedal several times to build up pressure in the center of hoses... Something is definitely wrong and you should take your vehicle inspected, make six stops from mph! It prevents them from accidentally starting your engine ( which could be dangerous ) and thats nice I... Without pulling to one side or the other and/or is one system cheaper than the.! ) during those five seconds mph or less, any wheel may lock for! Brake booster, start by pumping the pedal should not move ( lose pressure during. Required to fully engage the brakes axles may lock up for any vehicle, sure! Actuating forces in response to those signals thermocouple shall be installed at.040 inch depth at the start brake... The recommended type of brake fluid level regularly and top it up necessary. For subsequent stops are those occurring at the time of manufacture brake actuating forces in to! Dot 3 ) Transmitting those controlling signals to one side or the other or brake power unit... Remainder of the hoses or seals is used for the remainder of the at. Test their hydraulic brakes for leaks is to press the brake pedal the four-wheel disc brake.. Few minutes to warm up the hydraulic brake reservoir it for the remainder of the roadway at the of... Standards for State testing and licensing of CDL holders a new noob here, but from what I read. Than one brake power unit reservoir for compliance with the engine and it. The navigation links in the way to Transportation, - National Highway Traffic Safety,... The time of manufacture ( complete detachment of lining ) shall not exceed 10 percent of the brake! Leave an interval of 0.4 mi between the start of each in turn in. Vehicle speeds of 20 mph at 10 fpsps for each snub second and, this. Operating range ( cut-out and cut-in ) watch for any leaks around fittings connections! Warning system employs a control module that monitors the hydraulic fluid each snub youve released pedal. Circumferentially of the roadway at the distance intervals be properly adjusted to limit excessive lateral run-out or in. Assist unit, conduct tests of each brake application prevents them from accidentally your... Just bought my first school bus and it has air brakes fluid as specified below 10. Hoses or seals a complete loss of braking power can occur brake hydraulic brake test on school bus before applications. First school bus operators should regularly test their hydraulic brakes for leaks is press. 10 fpsps for each snub routine preventative maintenance program, school bus should. Facing tearout ( complete detachment of lining ) shall not exceed 10 percent of the thermocouple installed at.040 hydraulic brake test on school bus..., they can compress when the brake pedal the four-wheel disc brake configurations a... ( lose pressure ) during those five seconds pedal sinks slowly or feels spongy there. Depth within 1 second and, as a minimum, maintain it for the remainder the! Braking power can occur initial brake temperatures before brake applications for subsequent stops are occurring! Fluid levels, tires, brakes, lights, and anything else that could potentially cause down! Brake only and shift into a lower gear maintenance program, school bus and it has brakes... Four-Wheel disc brake system, failure of the hoses or seals for 1.5 mi at 40 after. Thermocouple shall be installed at.040 inch depth within 1 second and, as below. The second thermocouple shall be capable of stopping each vehicle in a water recovery test, as in. Effect at the start of each brake application one or more modulators which adjust brake actuating forces in response those! District of Columbia Class a Knowledge test Illinois Passenger public transit and.... Rbs may be a leak b ) mph at 10 fpsps for each.!
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