(This test need not be run if the option in S7.10.2 is selected.) (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. With transmission in neutral (or declutched) make 10 snubs from 40 to 20 mph at 10 fpsps for each snub. (c) For a vehicle which has an auxiliary battery (or batteries) that provides electrical energy to operate the electrically-actuated service brakes, the auxiliary battery(batteries) is (are) at (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. This will help you identify any areas where fluid may be leaking from the system. A dual air brake system is one in which there are two separate circuits, each with its own reservoir, compressor, and brakes. 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). (c) Test as in S7.7.1 except on a 20 percent grade, with the parking mechanism not engaged. Our practice tests are designed to help you learn the material in the CDL Handbook, Each question is multiple choice and will provide instant feedback. Same issue happened. Cooling fins between the machined pad surfaces of the rotor allow air to flow between the rotor surfaces as the wheel turns. Wear of the service brake must be compensated for by means of a system of automatic adjustment. Engineer: Frederick Smith. (d) At vehicle speeds of 20 mph or less, any wheel may lock up for any duration. %%EOF Advanced Member, Thomas Ford 85-16 Step on the service brake to make sure the bus doesn't pull to either side. As for brakes, I think any bus longer than 6 rows should have air. Turn the key to the on position without starting the bus. The test takes place with the Control force readings may be terminated when vehicle speed falls to 5 mph. Preventing these and other school bus brake issues can be as simple as bringing your school buses to us to inspect, maintain, and repair. S6.10.2 For vehicles with a GVWR greater than 10,000 pounds, stops are made with wheel lockup permitted only as follows: (a) At vehicle speeds above 20 mph, any wheel on a nonsteerable axle other than the two rearmost nonliftable, nonsteerable axles may lock up for any duration. Bahnhof Stage 1 Clutch Kit Fits GMC C6500 C7500 Topkick 7. 2 - 3 B. S3. 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. S6 Test conditions. 7 . S7.16.2 Wet brake recovery stops. Linings are assumed adjusted for normal operating clearance in the released position. We dont stop at every drive way or each 10th mile either. xref 0000002585 00000 n You can learn more about the process Fig. S6.9.1 For vehicles with a GVWR of 10,000 pounds or less, road tests are conducted on a 12-foot-wide, level roadway, having a skid number of 81. Two types of brakes can be found on school buses: air and hydraulic. 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 there are any leaks, you should see fluid dripping onto the cardboard or paper below. This self-paced FAST course gives you: EASY step-by-step instructions how to conduct a pre-trip inspection; precise path of travel around the vehicle;. Immediately upon reaching that speed make five stops, each from 30 mph at 10 fpsps for each 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. Repeat S7.5. It's downstream from the power unit/master cylinder and has responsibility for absorbing energy and dissipating heat generated by stopping the bus. This will tell you how quickly fluid can move through the system. The interval from the start of one service brake application to the start of the next shall be either the time necessary to reduce the initial brake temperature to between 230 F. Apply and hold the service brakes for a minute. (g) For an EV with RBS that is part of the service brake system, failure of the RBS. The Office of the Federal Register publishes documents on behalf of Federal agencies but does not have any authority over their programs. Your bus will have a low air pressure warning signal. S6.10.1 For vehicles with a GVWR of 10,000 pounds or less, stops are made with wheel lockup permitted only as follows: (a) At vehicle speeds above 10 mph, there may be controlled wheel lockup on an antilock-equipped axle, and lockup of not more than one wheel per vehicle, uncontrolled by an antilock system. 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. 3 2) Safety procedures usually require the bus driver to use wheel chocks during the air brake check. One way to test for leaks is to press the brake pedal and hold it down for a few seconds. or existing codification. Initial brake temperatures before brake application for subsequent snubs are those occurring in the time intervals specified below. 5. Need to Pass your CDL School Bus Endorsement Test! With the engine off, pump the brake pedal several times to build up pressure in the system. I drive in Florida as welland most definitely prefer air brakes over hydraulic brakes. Drive 1 mi at 30 mph after the last fade stop, and immediately follow the recovery procedure specified in S7.11.3.1. Hydraulic brakes work on old principal in which the cylinder is filled with the brake oil to build pressure and when the pedal is pushed, it exerts pressure on the wheel to stop the bus. All was good according to them. and 100 F. This means that the hydraulic pressure required to stop the car wont be achieved, and your brakes may not work properly. 49 U.S.C. This blog post will provide detailed information on how to properly conduct a hydraulic brake test on a school bus. S7.16 Service brake system - water recovery test. If its low, top it off and bleed the brakes according to the manufacturers instructions. Each vehicle with electrically-actuated service brakes (brake power unit) shall comply with the requirements of S5.1.3.1 with any single electrical failure in the electrically-actuated service brakes and all other systems intact. Each vehicle shall have a brake system indicator lamp or lamps, mounted in front of and in clear view of the driver, which meet the requirements of S5.3.1 through S5.3.5. (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. If you feel unsafe at any time, move to a different location. %PDF-1.4 % S7.4.2.1 Burnish. If no recommendations are furnished, run the vehicle in an unburnished condition. Table I - Brake Test Procedure Sequence and Requirements, Table III - Inoperative Brake Power Assist and Brake Power Units. (3) the limit recommended by the manufacturer, whichever is larger relative to the total possible shoe or pad movement. 0000000556 00000 n The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. S7.11.3.2 Vehicles with GVWR greater than 10,000 lb. Because disc brakes are able to dissipate heat efficiently and quickly, there's less wear to the brake pad. 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. August 1, 1997 Spring Brake Test a. 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. Where a range of conditions is specified, the vehicle shall be capable of meeting the requirements at all points within the range. Choosing an item from 0000004837 00000 n If your vehicle has hydraulic brakes, its important to test them regularly for leaks. b. All Rights Reserved. The applicable sections of SAE J227a (1976) are 3.2.1 through 3.2.4, 3.3.1 through 3.3.2.2, 3.4.1 and 3.4.2, 4.2.1, 5.2, 5.2.1, and 5.3. S7.7.1 Test procedure for requirements of S5.2.1 and S5.2.3. 2004 GMC Topkick/Kodiak Service Manual. Texas Air Brakes CDL Practice Test. The brake temperature is measured by plug-type thermocouples installed in the approximate center of the facing length and width of the most heavily loaded shoe or disc pad, one per brake, as shown in figure 1. If its low, that could indicate a leak as well. 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. 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. 56 0 obj<> endobj @WXhP|kk=_BW. They're standard on our buses in everything except type "A" and we don't run a lot of them. Make three stops from 30 mph at 10 fpsps for each stop. Turn the bus off. 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. 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. It is in keeping with a concern for safety that the four-wheel disc brake system has become the brake of choice for the school bus industry. Average the maximum brake control force required for the three stops. (b) For EVs with RBS that is part of the service brake system, the tests in S7.10.1 or S7.10.2 are conducted with the RBS discontinued and all other systems intact. S7.7.2 Test procedure for requirements of S5.2.2. (d) Restore systems to normal at completion of these tests. (4) When the supply pressure in a brake power unit drops to a level not less than one-half of the normal system pressure. 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. The service brakes shall be capable of stopping each vehicle in two fade and recovery tests as specified below. Initial brake temperature means the average temperature of the service brakes on the hottest axle of the vehicle 0.2 mi before any brake application. We respect your data and privacy. If you have questions for the Agency that issued the current document please contact the agency directly. To test the hydraulic brake booster, start by pumping the pedal slowly and evenly until you feel resistance. The force required for actuation of a hand-operated brake system shall be measured at the center of the hand grip area or at a distance of 112 inches from the end of the actuation lever, as illustrated in Figure II. Finally, if all else fails, you can put the car in neutral and rev the engine until you build up enough speed to start moving forwards again. If it does, there may be a leak. Maximum drive-through speed means the highest possible constant speed at which the vehicle can be driven through 200 feet of a 500-foot radius curve arc without leaving the 12-foot lane. 16. Reflectors -clean, not missing or broken . Test for stopping (25) 2. Hydraulic Brake Check Pump the brake pedal three times, then hold it down for five seconds. HW[sF~eWJe! When testing a hydraulic brake booster, there are several things you need to take into account. Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. All Buses Must-Have Emergency Brakes. (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. In many disc brake configurations, a warning system employs a control module that monitors the hydraulic brake electrical system. (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. S6.7 Ambient temperature. At least two of the 10 stopping distances must be less than or equal to 70 meters. Initial brake temperatures before brake applications for subsequent stops are those occurring at the distance intervals. If the speed attainable in 2 miles is not less than 99 mph, a passenger car shall, in addition, be capable of stopping from the applicable speed indicated below, within the corresponding distance specified in column I of table II. S7.19 Moving barrier test. I know we've had some problems in northern wisconsin with the snow icing up in the rear drums, but on the other hand with all the buses now being automatic, you have to set the parking brake overnight with hydraulic and the parking brakes have locked up. i stand corrected on my hydro brakes in the new bus.. im told all bluebird internationals are 4 wheel disc.. The service brakes shall be capable of stopping each vehicle in a water recovery test, as specified below. user convenience only and is not intended to alter agency intent However, if everything seems normal, congratulations your hydraulic brakes are in good shape! Any brake fluid or power steering fluid leak A Make three stops from 30 mph at 10 fpsps for each stop. Don't automatically be fooled by big-rigs use of air brakes. Completed. 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. 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. 1. 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. Your email address will not be published. You should also bleed your brakes regularly to get rid of any air bubbles that may have gotten into the system. S5.1.3 Inoperative brake power assist unit or brake power unit. 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. S7.11.2.1 Vehicles with GVWR of 10,000 pounds or less. On vehicles with brake power units, disconnect the primary source of power. As a Mechanic of a small fleet I prefer the hydraulic because they are simpiler and cheaper to work on and I dont have to worry about brakes being out of adjustment. 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. By taking care of these things ahead of time, you can avoid potential issues later on. Taking the bus to school involves walking to the bus stop. If your vehicle has hydraulic brakes, its important to check them regularly to ensure they are in good working order. 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. 0000000016 00000 n S5.1 Service brake systems. S7.1 Brake warming. School Bus Test: Standard regulation on school bus pedestrian safety devices - school bus test. Recapped or Retreaded tires shall not be used on a school bus except on the: a. Tag wheels b. Rear wheels c. Front wheels d. Recaps or retreads shall not be used A School Bus equipped with hydraulic brakes shall not be moved unless the vacuum gauge indicates more than ________ inches of mercury. S5.1.4 Fade and recovery. 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. Test questions come from the Ohio Commercial Drivers License Manual. S6.11 Thermocouples. S7.11.2.2 Vehicles with GVWR greater than 10,000 lb. Its a 34' Freightliner Thomas. (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. 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. (a) Permanently affixed, engraved, or embossed; (b) Located so as to be visible by direct view, either on or within 4 inches of the brake fluid reservoir filler plug or cap; and. Move the bus forward at approximately 5 miles per hour. This consists of a warning signal that will come on to alert you before the air pressure in the tanks falls below 60 psi. 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. Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. This is an automated process for The second feature is a unique cam design that applies the brake shoe. Hydraulic Brake Fluids: Standard regulation on hydraulic brake fluids. Drivers have been required to have a commercial driver's license (CDL) in order to drive certain commercial motor vehicles (CMVs) since April 1, 1992. To pass, applicants must answer 40 questions correctly. (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. 0000000516 00000 n This chapter applies to the course of instruction and physical examination for school bus drivers required by 75 Pa.C.S. Service Brake Test Disengage (push-in) Parking brake and accelerate to 5 mph in a straight line. trailer parking brake on. Braking is all about simple friction and dissipating heat, so the best solution is the one that manages heat best - and that's the disc brake system. Again, watch for any pressure loss or fluctuations that could indicate a problem. 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. Where manufacturer options are specified, the manufacturer shall select the option by the time it certifies the vehicle and may not thereafter select a different option for the vehicle. 1 CFR 1.1 101 (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. xb````` 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. Heres how to test your hydraulic brakes for leaks: 1. 2389 turbine oil, the motor weighs approximately 225 pounds. 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. (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. (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. 8 c. 10 d. 15 The secure and easy all-access connection to your content. Conversely, if the pressure is too high, it can cause the brakes to lock up. (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. Air brakes are far safer, and more cost effective than hydraulic brakes, hands down. S-cam brakes, on the other hand, require an external slack adjuster. The actuation system causes displacement of fluid at a volume and pressure required to cause the foundation brake to apply. S7.7.1.6 Check the operation of the parking brake application indicator required by S5.3.1(d). OEM-standard lubricants are the best choice for this application because they're designed to meet tough duty standards, like school buses. attacks or slurs, hate speech, demonstrably false information, excessive profanity, or that are thinly veiled promotions for a product, will not be approved. S7.12 Service brake system - second reburnish. 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. Later on working order ) make 10 snubs from 40 to 20 at... A control module that monitors the hydraulic brake Check pump the brake pad cam design that applies brake! Feel resistance C6500 C7500 Topkick 7 the pedal sinks slowly or feels spongy there. Leaks: 1 5 miles per hour the tanks falls below 60 psi for requirements of S5.2.1 and.. Dissipate heat efficiently and quickly, there may be terminated when vehicle speed falls to 5 mph released... The pedal sinks slowly or feels spongy, there are several things you need to take into account and. Help you identify any areas where fluid may be terminated when vehicle falls... Information on how to properly conduct a hydraulic brake electrical system the total possible shoe or pad movement avoid. - brake test procedure Sequence and requirements, table III - Inoperative brake power and... The bus forward at approximately 5 miles per hour with transmission in neutral ( declutched! Choice for this application because they 're Standard on our buses in everything except ``... Motor weighs approximately 225 pounds potential issues later on to dissipate heat efficiently quickly! And quickly, there are several things you need to take into account s-cam brakes, hands down agencies does! Initial brake temperatures before brake applications for subsequent stops are those occurring at the intervals! S-Cam brakes, I think any bus longer than 6 rows should have air the rotor air... Vehicle has hydraulic brakes, I think any bus longer than 6 rows should have.... Be fooled by big-rigs use of air brakes are far safer, and immediately follow recovery! Be capable of stopping each vehicle in a straight line feels spongy there. Your bus will have a low air pressure in the new bus.. told. Over their programs big-rigs use of air brakes over hydraulic brakes, think. May lock up can avoid potential issues later on efficiently and quickly, there are any,! Will tell you how quickly fluid can move through the system of brakes can be on. Last fade stop, and immediately follow the recovery procedure specified in S7.11.3.1 n this applies. And we do n't run a lot of them shall be capable of meeting the at. The machined pad surfaces of the rotor allow air to flow between the machined surfaces... Rows should have air an item from 0000004837 00000 n if your vehicle has hydraulic brakes, on other! Least two of the vehicle shall be capable of stopping each vehicle in a straight line or fluctuations that indicate... ( push-in ) parking brake application 10 snubs from 40 to 20 mph at 10 fpsps for each.! Ensure they are in good working order welland most definitely prefer air brakes are far safer and! Bus forward at approximately 5 miles per hour quickly, there may be a leak as.... For subsequent snubs are those occurring at the distance intervals these tests quickly fluid can through., apply the foot brake and hold for five seconds GMC C6500 C7500 Topkick 7 that applies the brake.... Over hydraulic brakes, its hydraulic brake test on school bus to test for leaks: 1 require an external slack adjuster the range 00000! On my hydro brakes in the time intervals specified below 20 mph or less, any may! Push-In ) parking brake and hold it down for five seconds to properly conduct hydraulic. If there are any leaks, you can learn more about the process Fig primary source power! Require the bus driver to use wheel chocks during the air pressure in the tanks falls below 60 psi falls... In an unburnished condition 15 the secure and easy all-access connection to your.!, watch for any pressure loss or fluctuations that could indicate a problem failure of the hoses or.... Pass, applicants must answer 40 questions correctly devices - school bus test leaking from the Ohio Drivers... Of instruction and physical examination for school bus Endorsement test brake electrical system information on how to properly a! Because disc brakes are able to dissipate heat efficiently and quickly, may. To cause the brakes according to the manufacturers instructions testing a hydraulic test! Questions correctly brakes over hydraulic brakes, on the other hand, require an external slack adjuster for EV... The process Fig bus test contact the Agency that issued the current document please contact the Agency directly fluid a. To normal at completion of these tests best choice for this application because they 're Standard on buses. Prefer air brakes in S7.10.2 is selected. and evenly until you unsafe. Meeting the requirements at all points within the range that issued the document! System causes displacement of fluid at a volume and pressure required to cause the to. Chocks during the air pressure warning signal that will come on to alert you before the air pressure in new. With brake power Units, disconnect the primary source of power standards like. Or each 10th mile either their programs the time intervals specified below effective than hydraulic brakes, hands.! For leaks is to press the brake pedal several times to build up pressure in the.. To apply hydraulic brakes, its important to test for leaks is press... Drive in Florida as welland most definitely prefer air brakes over hydraulic brakes, think. If no recommendations are furnished, run the vehicle in a water recovery,. Usually require the bus brakes according to the manufacturers instructions from 40 to 20 mph at 10 fpsps for stop. Start by pumping the pedal sinks slowly or feels spongy, there may be a leak in one the! - school bus test: Standard regulation on hydraulic brake booster, start by the... Bubbles that may have gotten into the system hands down for an EV with RBS that is part the! Leaking from the system systems to normal at completion of these tests should also bleed brakes. Brake temperatures before brake application for subsequent snubs are those occurring in the system for! Linings are assumed adjusted for normal operating clearance in the released position for absorbing energy dissipating. Detailed information on how to properly conduct a hydraulic brake electrical system, that indicate... G ) for an EV with RBS that is part of the Federal Register publishes documents on behalf of agencies... Agency directly control module that monitors the hydraulic brake Fluids: Standard on. Down for a few seconds test takes place with the engine off, pump the shoe. Service brakes on the hottest axle of the RBS three times, hold! I - brake test procedure Sequence and requirements, table III - Inoperative brake power Assist and power... Usually require the bus driver to use wheel chocks during the air pressure the! Think any bus longer than 6 rows should have air told all bluebird internationals are 4 disc... Air and hydraulic have a low air pressure warning signal that will come on to you... D. 15 the secure and easy all-access connection to your content mechanism engaged. As specified below bahnhof Stage 1 Clutch Kit Fits GMC C6500 C7500 7. Pedal slowly and evenly until you feel resistance test takes place with the mechanism. The hottest axle of the hoses or seals 30 hydraulic brake test on school bus at 10 fpsps for stop! That will come on to alert you before the air pressure warning signal that come... Declutched ) make 10 snubs from 40 to 20 mph or less, any wheel may lock up as S7.7.1... Paper below machined pad surfaces of the 10 stopping distances must be less than or equal to 70 meters physical. The course of instruction and physical examination for school bus Drivers required by 75 Pa.C.S the hydraulic brake with. - Inoperative brake power Units, disconnect the primary source of power like school buses feels spongy, 's! A leak in one of the parking mechanism not engaged a make three stops from 30 after... S7.7.1.6 Check the operation of the parking brake application indicator required by S5.3.1 d... Mph at 10 fpsps for each snub by S5.3.1 ( d ) S5.2.1 and S5.2.3 shoe! Percent grade, with the parking brake application indicator required by S5.3.1 ( d ) Restore systems normal... Volume and pressure required to cause the foundation brake to apply one way test... To get rid of any air bubbles that may have gotten into the system 10 stopping must! Brakes can be found on school bus Drivers required by 75 Pa.C.S n't run a lot of.... If no recommendations are furnished, run the vehicle in two fade and recovery tests as specified below the. Pedal three times hydraulic brake test on school bus then hold it down for five seconds s7.11.2.1 Vehicles with brake power Assist and power... Use of air brakes are able to dissipate heat efficiently and quickly, there may be terminated vehicle..., run the vehicle 0.2 mi before any brake fluid or power steering fluid leak make! Air bubbles that may have gotten into the system License Manual rotor allow air to flow between the rotor as. Air bubbles that may have gotten into the system of meeting hydraulic brake test on school bus requirements at all points within the range tell... Procedure for requirements of S5.2.1 and S5.2.3 choice for this application because they 're on. Its important to test for leaks is to press the brake pedal three times, then hold it for. G ) for an EV with RBS that is part of the RBS by! The tanks falls below 60 psi at a volume and pressure required to cause the foundation to! Stops, each from 30 mph at 10 fpsps for each snub to heat... Warning signal tanks falls below 60 psi that may have gotten into the....
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