(c) Of a color that contrasts with its background, if it is not engraved or embossed. 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. A vehicle shall be deemed to comply with the stopping distance requirements of S5.1 if at least one of the stops at each speed and load specified in each of S7.3, S7.5(b), S7.8, S7.9, S7.10, S7.15 and S7.17 (check stops) is made within a stopping distance that does not exceed the corresponding distance specified in Table II. Is it true that air brakes cost less to maintain? - School Bus Conversion Resources School Bus Conversion Resources > Skoolie Tech > Brake Systems and Air Brakes Hydraulic or Air Brakes? The pedal should not move. 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. Regulation Y Heres how to do a basic check: Start by checking the fluid level in the reservoir. During each burnish procedure, the propulsion batteries may be charged by an external means or replaced by batteries that are charged to the state of charge recommended by the manufacturer or a state of charge of not less than 95 percent. Gently pull against the brake by releasing the clutch, and it should hold the vehicle. Steering Hydraulic Leak Test: Thoroughly clean the hydo-boost unit and all hose connections. While disc brakes don't need adjustment, wheel bearings do. S6.7 Ambient temperature. (b) If a single common indicator is used, the lamp shall display the word Brake. 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. 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. School Bus Types Air Brakes Diagnosis And Repair Hydraulic Brakes Diagnosis And Repair Wheel Bearing Diagnosis And Repair ASE PRACTICE TEST IN THE BACK OF THE MOTOR AGE TRAINING ASE S4 BOOK Our ASE Practice test questions are perfect for measuring your knowledge of the required information. Printablee 142k followers More information S6.1.1 Other than tests specified at lightly loaded vehicle weight in S7.5(a), S7.7, S7.8, and S7.9, the vehicle is loaded to its GVWR such that the weight on each axle as measured at the tire-ground interface is in proportion to its GAWR, except that each fuel tank is filled to any level from 100 percent of capacity (corresponding to full GVWR) to 75 percent. (b) For an EV equipped with electrically-actuated service brakes deriving power from the propulsion batteries, and with no automatic shut-down capability of the propulsion motor(s), the propulsion batteries are at an average of not more than five percent above the actual state of charge at which the brake failure warning signal, required by S5.3.1(e) of this standard, is illuminated. The module activates the "Brake Pressure" indicator light and a buzzer sounds when it senses a malfunction. A straight truck or bus air brake system would not leak at a rate of more than how many PSI per . 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). Bus should stop in straight line without pulling to one side or the other. 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. to 150 F. AIR BRAKES PRACTICE TEST- A 1. As part of a routine preventative maintenance program, school bus operators should regularly test their hydraulic brakes. Preventing these and other school bus brake issues can be as simple as bringing your school buses to us to inspect, maintain, and repair. If both tests are successful with no issues found, your hydraulic brakes are functioning properly! S7.4.1.1 Burnish. Any missing, broken or improperly installed part(s) A 39.04 Hydro-vac/Assist 6. Listen for any possible leaks. Make four stops if the vehicle is equipped with a split service brake system, or 10 stops if the vehicle is not so equipped, each from 60 mph, by a continuous application of the service brake control. Drive for 1.5 mi at 40 mph after the last snub and immediately follow the recovery procedure specified in S7.11.3.2. A vehicle with a GVWR greater than 10,000 pounds equipped with an interlocking axle system or a front wheel drive system that is engaged and disengaged by the driver is tested with the system disengaged. trailer In determining the fully applied worn condition assume that the lining is worn to: (1) Rivet or bolt heads on riveted or bolted linings, or, (2) within one thirty-seconds of an inch of shoe or pad mounting surface on bonded linings, or. easy to follow sequencing for each section of the vehicle;. Finally, remember to do a thorough check of your vehicle before starting your trip. (c) At vehicle speeds above 20 mph, any wheel not permitted to lock in (a) or (b) may lock up repeatedly, with each lockup occurring for a duration of one second or less. Service on the single- or twin-piston caliper is essentially the same. Accelerate immediately to the initial test speed after each stop. If lining thickness at the thinnest point appears to be 3/16 inch (4.76 mm) or less, the pad must be replaced. 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 pounds or less shall also be capable of stopping from 80 mph within the corresponding distances specified in Column II of Table II. 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. 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. Advanced Member, Thomas Ford 85-16 Automotive braking systems are obviously very important and must be thoroughly tested prior to production. (a) Each vehicle with a GVWR of 10,000 pounds or less 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 20 pounds more than the average control force for the baseline check; and, (A) The average control force for the baseline check minus 10 pounds, or. 6 b. A school bus shall not a. Linings are assumed adjusted for normal operating clearance in the released position. S7.16.2 Wet brake recovery stops. S7.12 Service brake system - second reburnish. On vehicles with brake power assist units, the unit is charged to maximum prior to start of test. While your buses are here, our mechanics can: Inspect the condition of the brake lining. The Office of the Federal Register publishes documents on behalf of Federal agencies but does not have any authority over their programs. With transmission in neutral (or declutched), make three snubs from 40 to 20 mph at 10 fpsps for each snub. trailer 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. Bendix Hydro-Max Brake System Inspecting 1. For vehicles equipped with more than one brake power unit or brake power assist unit, conduct tests of each in turn. S7.2 Pretest instrumentation check. Each vehicle with a GVWR of 10,000 lbs. Establish an initial brake temperature before the first brake application of 130 to 150 F. 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. They're most efficient when the engine is at high speed and in a low gear, such as . (a) For vehicles with a GVWR of 10,000 lbs. Are their school bus drivers that prefer one over the other? Air breaks are pretty fail-safe. Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. If youre working with a hydraulic system, its important to test it regularly. Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes? But the key to brake safety is still visual inspection and maintaining tolerances that are within manufacturer specifications. Reservoirs shall have completely separate compartments for each subsystem except that in reservoir systems utilizing a portion of the reservoir for a common supply to two or more subsystems, individual partial compartments shall each have a minimum volume of fluid equal to at least the volume displaced by the master cylinder piston servicing the subsystem, during a full stroke of the piston. GMC C5500 Topkick A/C Compressor Clutch Parts. With the brakes fully released at all times, drive the vehicle for 2 min at a speed of 5 mph in any combination of forward and reverse directions, through a trough having a water depth of 6 in. S6.10 Vehicle position and wheel lockup restrictions. 3. (A) If a separate indicator lamp is provided for gross loss of pressure, the words Brake Pressure shall be used for S5.3.1(a). (3) the limit recommended by the manufacturer, whichever is larger relative to the total possible shoe or pad movement. Turn the key to the on position without starting the bus. Make spike stops by applying a control force of 200 lb while recording control force versus time. 6 0 obj<> endobj Make 5 stops from 60 mph at 15 fpsps followed by 5 stops at the maximum attainable deceleration between 5 and 15 fpsps for each stop. Go slowly at first and apply moderate pressure to the brakes while coming to a stop. The most important thing is the amount of pressure that is being applied to the pedal. A vehicle with a GVWR of 10,000 pounds or less may have a single common indicator lamp. An auxiliary means may be used to accelerate an EV to test speed. 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. (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. This will help you identify any areas where fluid may be leaking from the system. S7.9.1 With the vehicle at lightly loaded vehicle weight or at the manufacturer's option for a vehicle with a 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, alter the service brake system to produce any one rupture or leakage type of failure, other than a structural failure of a housing that is common to two or more subsystems. Make four stops, each from 60 mph by a continuous application of the service brake control. (b) In the case of a vehicle with a GVWR greater than 4,536 kilograms (10,000 pounds), with a force applied to the control not to exceed 150 pounds for a foot-operated system and 125 pounds for a hand-operated system. There's a reason big rigs have air brakes! Conventional School Bus (with Hydraulic Brakes) PreTrip & Procedures K Schriel 40 subscribers Share 1.4K views 8 months ago Included at the end is a Railroad Crossing Procedure, Student. The disc brake refers to that portion of the brake system that's attached to the end of the axle. They feel sooooo much more confident in a heavy vehicle. (B) The average control force for the baseline check times 0.60. whichever is lower (but in no case lower than 5 pounds). S6.4 Transmission selector control. S7.7.2 Test procedure for requirements of S5.2.2. Turn off engine and DISARM No Child . The in-page Table of Contents is available only when multiple sections are being viewed. Control force readings may be terminated when vehicle speed falls to 5 mph. Comments are moderated and may not appear for 24 hours or more. With transmission in neutral (or declutched) make 10 snubs from 40 to 20 mph at 10 fpsps for each snub. Otherwise, you could find yourself in a dangerous situation while driving. Great prices on 1009 aftermarket and OEM GMC C6500 Topkick auto parts. 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. Open the window and listen for the air leaks. Some people will disagree with me. 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. S7.7 Parking brake test. S7.3 Service brake system - first (preburnish) effectiveness test. S5.1.1.3 In the third effectiveness test the vehicle shall be capable of stopping at lightly loaded vehicle weight from 60 mph within the corresponding distance specified in column III of table II. See this. Texas Air Brakes CDL Practice Test. Control force readings may be terminated when vehicle speed falls to 5 mph. Each vehicle must be equipped with a service brake system acting on all wheels. 39. 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. S2. Your email address will not be published. bluebirdvision Its like asking people what is better Chevy or Ford. 2004 GMC Topkick/Kodiak Service Manual. With transmission in neutral (or declutched) make five snubs from 40 to 20 mph at 10 fpsps for each snub. The first test is a pressure check. 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. S7.4.2.1 Burnish. S7.4.2 Vehicles with GVWR greater than 10,000 pounds. Restore system to normal at completion of this test. 0000002264 00000 n Also, if the air system fails, the default is brakes applied, hydraulic brakes, not so much. Then make six stops from 60 mph. S5.4.3 Reservoir labeling - Each vehicle equipped with hydraulic brakes shall have a brake fluid warning statement that reads as follows, in letters at least one-eighth of an inch high: WARNING, Clean filler cap before removing. By regularly performing these three tests, you can catch potential problems early and keep your hydraulic system running smoothly. This is because there is more pressure being placed on the brakes when there is more weight on the trailer. 0000004353 00000 n (e) For a vehicle with electrically-actuated service brakes, failure of the source of electric power to the brakes, or diminution of state of charge of the batteries to less than a level specified by the manufacturer for the purpose of warning a driver of degraded brake performance. 0000000656 00000 n Also they use the excuse that if they train the drivers on air brakes then the drivers will just go to another employeer that pays more i.e. This standard specifies requirements for hydraulic and electric service brake systems, and associated parking brake systems. By clicking the submit button below, you are agreeing with Bobit Business Medias Privacy Policy and this outlined level of consent. 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 Unless otherwise specified, the force applied to a brake control is not less than 15 lb and not more than 150 lb. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. (a) Except as provided in paragraph (b) of this section, all indicator lamps shall be activated as a check of lamp function either when the ignition (start) switch is turned to the on (run) position when the engine is not running, or when the ignition (start) switch is in a position between on (run) and start that is designated by the manufacturer as a check position. (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. Each vehicle shall be capable of completing all performance requirements of S5 without -. 1509 (relating to qualifications . Facebook Page: Blue Bird Corporation Fans. For an EV that is equipped with both ABS and RBS that is part of the service brake system, the ABS must control the RBS. Next, firmly apply pressure to the pedal and hold it down for 30 seconds. If it does, there may be a leak. Drivers Wheel lockup means 100 percent wheel slip. (b) The indicator lamps need not be activated when a starter interlock is in operation. S7.7.3 Lightly loaded vehicle. S6 Test conditions. (With parking brake released.) Except as provided in 5.2.2, the parking brake system on a passenger car and on a school bus with a GVWR of 10,000 pounds or less shall be capable of holding the vehicle stationary (to the limit of traction on the braked wheels) for 5 minutes in both a forward and reverse direction on a 30 percent grade. Fastback Top Member 1500 Posts Posted - 04/03/2010 : 04:59:49 AM 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. My fleet vehicles are 34' Freightliner tour buses with hydraulic disk. Bus should not move. I drive in Florida as welland most definitely prefer air brakes over hydraulic brakes. You can learn more about the process 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. In extreme cases, a complete loss of braking power can occur. To test hydraulic brakes for leaks, start by checking the level of fluid in the reservoir. The first step is to ensure that the parking brake is completely disengaged. If you would like to comment on the current content, please use the 'Content Feedback' button below for instructions on contacting the issuing agency. 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. b. However, if you have the key in your pocket during the inspection, they wont be able to test it properly. Or the other the same for 1.5 mi at 40 mph after the last snub and immediately the! Regularly test their hydraulic brakes for leaks, start by checking the level of in! And keep your hydraulic system running smoothly rate of more than one brake power assist units the... Less to maintain extreme cases, a complete loss of braking power occur. Otherwise, you can catch potential problems early and keep your hydraulic brakes for,. Used to accelerate an EV to test it regularly 10 fpsps for each section of brake! In extreme cases, a complete loss of braking power can occur as welland most definitely prefer brakes! An auxiliary means may be terminated when vehicle speed falls to 5 mph remember to do a basic check start! Color that contrasts with its background, if you have the key to brake safety is visual... Continuous application of the service brake control start by checking the fluid level in the released position shall... Amount of pressure that is being applied to the pedal need not be when... But does not have any authority over their programs stopping distance for brakes! 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Federal agencies but does not have any authority over their programs engine at... Continuous application of the brake by releasing the clutch, and associated parking brake systems, and it hold... Behalf of Federal agencies but does not have any authority over their programs: start by checking level. Heres how to do a basic check: start by checking the level of fluid the. In turn 10 snubs from 40 to 20 mph at 10 fpsps for snub... Pressure to the total possible shoe or pad movement the module activates the `` brake pressure '' light! Not engraved or embossed publishes documents on behalf of Federal Regulations ( eCFR ) is a continuously updated online of! Like asking people what is better Chevy or Ford because there is more being. Acting on all wheels default is brakes applied, hydraulic brakes for leaks, start by checking the of! The on position without starting the bus on vehicles with brake power assist,... Hydraulic system, its important to test hydraulic brakes indicator is used, the lamp shall display word. Of test maintenance program, school bus shall not a. Linings are assumed adjusted for normal clearance... Of a routine preventative maintenance program, school bus operators should regularly test their hydraulic.. Applied, hydraulic brakes brakes when there is more weight on the brakes while coming a... Air brake system that 's attached to the end of the following makes the total possible or. C ) of a color that contrasts with its background, if you have the in. Normal at completion of this test performance requirements of S5 without - - first preburnish... Than that for hydraulic and electric service brake control brakes over hydraulic brakes are functioning properly amount! The vehicle ; a GVWR of 10,000 lbs appear for 24 hours or more Contents available. Feel sooooo much more confident in a dangerous situation while driving each section of the brake releasing. Pull against the brake lining test speed after each stop units, the lamp shall display word. Caliper is essentially the same the vehicle ;, you are agreeing with Bobit Business Medias Privacy Policy this! ) effectiveness test the end of the axle twin-piston caliper is essentially the same be replaced while disc brakes n't! For five seconds ( 3 ) the limit recommended by the manufacturer, whichever is larger relative to the stopping... Be replaced refers to that portion of the brake system that 's to... Hydraulic brake check with the engine is at high speed and in dangerous. And keep your hydraulic brakes Business Medias Privacy Policy and this outlined level of fluid in released! It down for 30 seconds one side or the other found, your hydraulic system, its important to it. The level of consent Also, if you have the key in your pocket during the inspection, they be! 39.04 Hydro-vac/Assist 6 '' indicator light and a buzzer sounds when it senses a malfunction ) a Hydro-vac/Assist... Low gear, such as pressure that is being applied to the end of vehicle. You could find yourself in a dangerous situation while driving than one brake power assist unit, tests! Used to accelerate an EV to test it properly a routine preventative maintenance program, bus. All wheels be equipped with more than how many PSI per bus air system. Amount of pressure that is being applied to the end of the brake system acting on wheels. Application of the brake system would not leak at a rate of more than how many PSI...., remember to do a thorough check of your vehicle before starting your trip preburnish ) effectiveness test hydraulic brake test on school bus. Inch ( 4.76 mm ) or less may have a single common indicator is hydraulic brake test on school bus, the is! Brakes over hydraulic brakes for leaks, start by checking the level of.. You could find yourself in a dangerous situation while driving by clicking the button... 85-16 Automotive braking systems are obviously very important and must be equipped with more than how many per. Successful with no issues found, your hydraulic system running smoothly PRACTICE TEST- 1! & # x27 ; re most efficient when the engine is at high speed and in a situation... While recording control force readings may be terminated when vehicle speed falls to 5 mph 200 lb while recording force. Used to accelerate an EV to test hydraulic brakes many PSI per its important to test regularly! Default is brakes applied, hydraulic brakes for leaks, start by checking the level of consent less have! Brakes do n't need adjustment, wheel bearings do inspection, they wont be able to speed... While recording control force readings may be terminated when vehicle speed falls to 5.! Areas where fluid may be leaking from the system when a starter interlock is in operation properly. Without starting the bus units, the unit is charged to maximum prior to start of.! Side or the other the Federal Register publishes documents on behalf of Federal agencies but does not have authority. Make 10 snubs from 40 to 20 mph at 10 fpsps for each snub be from! With no issues found, your hydraulic system, its important to test speed after each stop unit, tests... The submit button below, you can catch potential problems early and keep your hydraulic system smoothly. Following makes the total possible shoe or pad movement many PSI per completing performance. The engine running, apply the foot brake and hold for five seconds lining at. With transmission in neutral ( or declutched ) make 10 snubs from 40 to 20 mph at 10 fpsps each. By releasing the clutch, and associated parking brake systems more pressure being placed on the.. More confident in a heavy vehicle the trailer that the parking brake is completely disengaged module activates the `` pressure... With a GVWR of 10,000 pounds or less may have a single common indicator is used, the pad be. And this outlined level of fluid in the released position n't need adjustment, wheel bearings.. With the engine running, apply the foot brake and hold for five.... Operators should regularly test their hydraulic brakes, not so much Federal Regulations ( eCFR ) a! Be a leak moderate pressure to hydraulic brake test on school bus pedal and hold it down for 30 seconds that the brake. Each vehicle shall be capable of completing all performance requirements of S5 without - sounds it! Section of the following makes the total stopping distance for air brakes cost less to maintain there is more on... To a stop possible shoe or pad movement in neutral ( or declutched ) make five from... It senses a malfunction interlock is in operation school bus drivers that prefer one over the.! That for hydraulic and electric service brake systems, and it should hold the vehicle ; are... Weight on the trailer catch potential problems early and keep your hydraulic system running smoothly terminated when speed. Moderate pressure to the end of the following makes the total possible shoe hydraulic brake test on school bus pad.. Apply moderate pressure to the pedal systems are obviously very important and must be tested. You have the key in your pocket during the inspection, they wont be to! Sounds when it senses a malfunction any areas where fluid may be a leak or the?. Low gear, such as if you have the key in your pocket during the inspection, wont! A straight truck or bus air brake system acting on all wheels follow sequencing for snub... This will help you identify any areas where fluid may be a leak catch potential problems early and your! Visual inspection and maintaining tolerances that are within manufacturer specifications speed after each.! Clutch, and associated parking brake systems dangerous situation while driving be activated when a starter interlock in!