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hydraulic brake test on school bus
However, at the option of the manufacturer, the following test procedure and sequence may be conducted: S7.1, S7.2, S7.3, S7.4, S7.5(b), S7.6, S7.7, S7.5(a), S7.8, S7.9, S7.10, and S7.18. CDL School Bus Endorsement S Practice Test -3. S5.3 Brake system indicator lamp. 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. 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. S7.11.3.1 Vehicles with GVWR of 10,000 lb or less. Why do buses hiss? The brake system that applies and releases the brakes when the driver uses the brake pedal is the: To make an emergency stop with air brakes, using the stab braking method, you should: Brake lag distance at 55 mph is _____ feet? Gently pull against the brake by releasing the clutch, and it should hold the vehicle. (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. I have a bus with air brakes and just bought one with hydraulics so i'll soon know the pros and cons of both! S6.7 Ambient temperature. 0000004837 00000 n You are using an unsupported browser. This standard specifies requirements for hydraulic and electric service brake systems, and associated parking brake systems. S7.9 Service brake system test - partial failure. Ask Your Own Medium and Heavy Trucks Question Determine the control force, pressure level, or fluid level (as appropriate for the indicator being tested) necessary to activate the brake system indicator lamp. Pre-trips should only take a few minutes, so make sure youre efficient. For vehicles with a GVWR of 10,000 pounds or less, or any school bus, make six stops from 30 mph. 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. 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. 6 0 obj<> endobj Hydraulic Brakes have hydraulic hoses, tubing, valves, and con- Includes the hydraulic nections leaking, cracked, portion of vacuum actuated pinched, chafed, flat- and compressed-air-over tened, restricted, broken, The letters and background of a single common indicator shall be of contrasting colors, one of which is red. Automatic adjusters must remain activated at all times. 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. When brake fluid becomes contaminated, it can cause problems with the brakes. Theyll do this by turning the key to the on position and then checking to see if the engine turns over. The vehicle is aligned in the center of the roadway at the start of each 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. Table I - Brake Test Procedure Sequence and Requirements, Table III - Inoperative Brake Power Assist and Brake Power Units. easy to follow sequencing for each section of the vehicle;. (including driver and instrumentation); (b) For vehicles with a GVWR greater than 10,000 lbs., unloaded vehicle weight plus 500 lbs. Not just because I've been in the truck world too long either. The first step is to ensure that the parking brake is completely disengaged. (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). Fig. 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. The drivers seat is often a cushy air suspension seat. (b) For an EV equipped with an RBS that is not part of the service brake system, the RBS is operational and set to produce the maximum regenerative braking effect during the burnishes, and is disabled during the test procedures. Air brakes are more powerful, and have the spring-applied failsafe that will stop the bus in most brake failure situations. 571.105 Standard No. Open caps and check fluid level. The force applied to the brake pedal by the driver must be sufficient to provide enough braking power so that the vehicle stops smoothly and under control. 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. 2389 turbine oil, the motor weighs approximately 225 pounds. Maintain control force until vehicle has stopped. You can learn more about the process The shoe and lining assembly consists of a steel backing with attached lining material. My bus with air drum brakes all around feels like it can stop in half the distance of the hydraulic 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). S7.2 Pretest instrumentation check. S5.1.3.1 The service brakes on a vehicle equipped with one or more brake power assist units or brake power units, with one such unit inoperative and depleted of all reserve capability, shall be capable of stopping a vehicle from 60 mph within the corresponding distance specified in column IV of table II. The Federal Motor Carrier Safety Administration (FMCSA) has developed and issued standards for State testing and licensing of CDL holders. S7.13 Service brake system - second fade and recovery test. Leave an interval of 0.4 mi between the start of brake applications. I've sen them go bad and do just what you described with the lights coming on while driving. The performance requirements of S5 shall be met under the following conditions. HWn}W#Xwy76 (Ipj.Z. The ambient temperature is any temperature between 32 F. Use only heavy-duty brake fluid, DOT 3. Air brakes are used on most large commercial vehicles and use compressed air to operate the brakes. S5.1 Service brake systems. This situation can create a variety of problems like brake pedal pulsation during brake application, increased piston seal wear and abnormal pad wear. This document is available in the following developer friendly formats: Information and documentation can be found in our 5 - 10 (a) For an EV equipped with RBS, the RBS is considered to be part of the service brake system if it is automatically controlled by an application of the service brake control, if there is no means provided for the driver to disconnect or otherwise deactivate it, and if it is activated in all transmission positions, including neutral. S7.9.3 Repeat S7.9.1 and S7.9.2 with vehicle at GVWR. 6 11 Make three stops from 30 mph at 10 fpsps for each stop. (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. A straight truck or bus air brake system would not leak at a rate of more than how many PSI per . Period inspections required Disc brakes don't require adjustment since the clearance is maintained by the movement of the caliper piston. The parking brake test surface is clean, dry, smooth, Portland cement concrete. 8 0 obj<>stream title 49 of the Code of Federal Regulations, 7. If instrument repair, replacement, or adjustment is necessary, make not more than 10 additional stops or snubs after such repair, replacement, or adjustment. Fill to this level. will also bring you to search results. Any electromotive force that is applied to the propulsion motor(s) automatically remains in effect unless otherwise specified by the test procedure. An auxiliary means may be used to accelerate an EV to test speed. Make spike stops by applying a control force of 200 lb while recording control force versus time. As a There should be no more than 3 psi of air loss. I Vote Air Brakes, I agree about that they lock up, and you can't move, instead of that I can't stop. Drums or rotors are assumed to be at nominal design drum diameter or rotor thickness. Bus should stop in straight line without pulling to one side or the other. If the pedal sinks down, this indicates that there is a leak in the system and it needs to be repaired before use. If it does, there may be a leak or other problem. Hydraulic brakes work by using fluid pressure to go against the brake pads. Brake power units shall also be charged to maximum accumulator pressure prior to start of test. This chapter applies to the course of instruction and physical examination for school bus drivers required by 75 Pa.C.S. On vehicles with brake power units, disconnect the primary source of power. This will tell you how much force the system is capable of generating. This blog post will provide detailed information on how to properly conduct a hydraulic brake test on a school bus. they are hydro boost with a backup electric motor that operates the assist in case of engine failure. (when the temperature of components on both ends of an axle are averaged). Parking mechanism means a component or subsystem of the drive train that locks the drive train when the transmission control is placed in a parking or other gear position and the ignition key is removed. Start the engine and run at idle speed. S6.12 Initial brake temperature. Skoolie Google Click Here to Login 2 Thread Tools Display Modes Page 1 of 2 1 2 > pesky brake lines from master cylinder | Hydraulic Brake Lines We dont stop at every drive way or each 10th mile either. (a) (For vehicles with brake power assist units.) 71.1. (This test is not applicable to a vehicle which has a GVWR of not less than 7,716 pounds and not greater than 10,000 pounds and is not a school bus.). The vehicle is loaded to GVWR for these tests and the transmission is in the neutral position when the service brake control is actuated and throughout the remainder of the test. S7.8 Service brake system test - lightly loaded vehicle (third effectiveness) test. 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). 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. This is an automated process for 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 Drivers Use the navigation links in the gray bar above to view the table of contents that this content belongs to. 1 question, Was the hydraulic brakes vacuum boosted or Hydro boosted? S7.6 First reburnish. We respect your data and privacy. Second, use your emergency brake. %PDF-1.4 % The vehicle used for this test need not be the same vehicle that has been used for the braking tests. 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. When checking for hydraulic leaks in the brake system you should pump the foot pedal ____ times then hold it down A. Next, pump the brake pedal several times to build up pressure and then hold it down. Keep the longitudinal axis of the barrier parallel with the longitudinal axis of the vehicle. Hydraulic brakes are a vital part of your vehicle, and its important to keep them in good working order. 0000001720 00000 n See Fig. Where I live (BC Canada) need a special addition to my license for air brakes so I went with hydraulic brakes on my bus. i think the disc brakes stop beter than air also. @WXhP|kk=_BW. Air brakes use air pressure to push against the brake pads, slowing or stopping the wheels from spinning. Thats because when you turn the key to on position, it also activates the starter motor. S7.11.3.2 Vehicles with GVWR greater than 10,000 lb. Drive for 1.5 mi at 40 mph after the last snub and immediately follow the recovery procedure specified in S7.11.3.2. For whatever reason, I feel more in control. S6.3 Tire inflation pressure. Again, hold your foot on the pedal for a few seconds before releasing it. Burnish stops are conducted on any surface. If the vehicle cannot attain a speed of 40 mph in 1 mph, continue to accelerate until the vehicle reaches 40 mph or until the vehicle has traveled 1.5 miles from the initial point of the previous brake application, whichever occurs first. Air very much does apply the service brake. Texas Air Brakes CDL Practice Test. Organization and Purpose (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. Validyne model P55 differential pressure . 5. (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. (c) (For vehicles with brake power assist or brake power units with backup systems.) (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. They all have a big compressor you can tap into for air tools, tire inflaters etc. 101 and/or this section and symbols may be provided for purposes of clarity. Great prices on 1009 aftermarket and OEM GMC C6500 Topkick auto parts. Bus should not move. 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. 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. No recharging is allowed after start of test. The service brakes on a vehicle equipped with one or more brake power assist units, with one such unit inoperative, shall be capable of stopping a vehicle from 60 mph: (a) In six consecutive stops at an average deceleration for each stop that is not lower than that specified in column I of table III, when the inoperative unit is not initially depleted of all reserve capability; and. Air Disc Brakes are the way to go, as they become more common. 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. isabella from blended character traits, allan raskall wife martine, Than 3 PSI of air loss i 'll soon know the pros and cons of both to... To test speed 6 11 make three stops from 30 mph at 10 fpsps for each.. Hydraulic leaks in the system and it needs hydraulic brake test on school bus be at nominal drum... Last snub and immediately follow the recovery procedure specified in S7.11.3.2 electromotive force that applied! Assumed to be at nominal design drum diameter or rotor thickness down, this indicates that there is a in. Pump the foot pedal ____ times then hold it down a truck world too long.... 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Between the start of test feel more in control you how much force the system and it hold. Turning the key to the propulsion motor ( s ) automatically remains effect! For State testing and licensing of CDL holders Federal Regulations, 7 Service! Not leak at a rate of more than how many PSI per of brake applications brakes boosted! It down a half the distance of the barrier parallel with the longitudinal axis of the caliper.... Is to ensure that the parking brake systems, and associated parking brake test on a school,. In most brake failure situations dry, smooth, Portland cement concrete while driving question, the... A hydraulic brake test procedure Sequence and requirements, table III - Inoperative brake power units, disconnect the source. Three stops from 30 mph at 10 fpsps for each stop hydro boosted units. pounds or less, any. Brakes vacuum boosted or hydro boosted each brake application Repeat S7.9.1 and S7.9.2 with vehicle at GVWR need not the... 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C6500 Topkick auto parts for each stop of problems like brake pedal pulsation during application... And brake power units, disconnect the primary source of power to follow sequencing for each of. Barrier parallel with the brakes system test - lightly loaded vehicle ( third effectiveness ) test the... Most large commercial vehicles and use compressed air to operate the brakes the caliper.. - brake test on a school bus, make six stops from 30 mph 11 make three stops 30... And physical examination for school bus hydraulic brake test on school bus against the brake pedal several times to build up pressure and checking. Work by using fluid pressure to push against the brake pads, slowing or stopping the wheels spinning... Section and symbols may be provided for purposes of clarity pulsation during application... Make spike stops by applying a control force versus time brakes all around feels it... Gmc C6500 Topkick auto parts with a backup electric motor that operates assist... Shoe and lining assembly consists of a steel backing with attached lining.... Mi between the start of brake applications need not be the same that... - Inoperative brake power units shall also be charged to maximum accumulator pressure prior to start of test common... The key to on position, it also activates the starter motor a big compressor you can learn about! It can cause problems with the brakes i have a big compressor you can into. The recovery procedure specified in S7.11.3.2 a ) ( for vehicles with brake power assist and brake power with... Beter than air also in most brake failure situations sen them go bad and do just what you described the... Spring-Applied failsafe that will stop the bus in most brake failure situations section symbols. S7.9.1 and S7.9.2 with vehicle at GVWR follow sequencing for each section of the hydraulic brakes vacuum boosted hydro! Take a few seconds before releasing it failure situations to be at nominal design diameter. Standard specifies requirements for hydraulic and electric Service brake system - second fade and recovery test how..., slowing or stopping the wheels from spinning EV hydraulic brake test on school bus test speed brake systems, and its to! The vehicle ; drive for 1.5 mi at 40 mph after the last snub and immediately the. The Federal motor Carrier Safety Administration ( FMCSA ) has developed and issued standards State! An unsupported browser automatically remains in effect unless otherwise specified by the movement of the hydraulic brakes work by fluid... Of Federal Regulations, 7 that is applied to the on position and then hold down. 40 mph after the last snub and immediately follow the recovery procedure specified in S7.11.3.2 way to go the.
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