hydraulic brake test on school bus

Dave Heiden CLP, you must be at least 18 years old. (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. Brake power assist unit means a device installed in a hydraulic brake system that reduces the operator effort required to actuate the system, and that if inoperative does not prevent the operator from braking the vehicle by a continued application of muscular force on the service brake control. 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. S7.3 Service brake system - first (preburnish) effectiveness test. The rotors on both front and rear brake groups are protected on the inboard side by splash shields bolted to the wheel end anchor plates. If its low, top it off and bleed the brakes according to the manufacturers instructions. Have you ever wondered why trucks and buses make those funny squeaking and hissing sounds? 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. S7.11.1.1 Vehicles with GVWR of 10,000 lb or less. Hydraulic brakes work by using fluid pressure to go against the brake pads. If the power assist fail on a hydraulic brake system A. you will NOT be able to stop the bus B. Keep up with regular maintenance according to your schedule and enjoy safe travels in your school bus! Use only heavy-duty brake fluid, DOT 3. (c) Of a color that contrasts with its background, if it is not engraved or embossed. Each vehicle must be equipped with a service brake system acting on all wheels. They are also less expensive on a new bus purchase, and many operations are in the mindset of buying cheap to save money up front. Fastback Top Member 1500 Posts Posted - 04/03/2010 : 04:59:49 AM (b) The indicator lamps need not be activated when a starter interlock is in operation. 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. Peak friction coefficient or PFC means the ratio of the maximum value of braking test wheel longitudinal force to the simultaneous vertical force occurring prior to wheel lockup, as the braking torque is progressively increased. Brake fluid is the most common problem in a brake hydraulic system. This content is from the eCFR and is authoritative but unofficial. (This test need not be run if the option in S7.10.2 is selected.) (b) If a single common indicator is used, the lamp shall display the word Brake. Choosing an item from i think the disc brakes stop beter than air also. No recharging is allowed after start of test. If you would like to comment on the current content, please use the 'Content Feedback' button below for instructions on contacting the issuing agency. Determine whether the brake system indicator lamp is activated when the RBS is disconnected. S7.2 Pretest instrumentation check. At least two of the 10 stopping distances must be less than or equal to 70 meters. This consists of a warning signal that will come on to alert you before the air pressure in the tanks falls below 60 psi. Each truck and bus (other than a school bus) with a GVWR of 4,536 kg (10,000 pounds) or less which is subject to this part and school buses with a GVWR greater than 4,536 kg (10,000 pounds) shall be equipped with a parking brake system as required by FMVSS No. This situation can create a variety of problems like brake pedal pulsation during brake application, increased piston seal wear and abnormal pad wear. Vehicles are burnished according to the following procedures. GMC C5500 Topkick A/C Compressor Clutch Parts. Allow a braking distance interval of 1 mi. Clearance Lights - clean, not missing or broken, Place a scrap piece of cardboard or paper under each wheel where the brake lines pass through. There are plenty of pros and cons about the systems. (b) For vehicles with a GVWR greater than 10,000 pounds, stability and control during braking tests are conducted on a 500-foot-radius curved roadway with a wet level surface having a peak friction coefficient of 0.55 when measured on a straight or curved section of the curved roadway using an ASTM F2493 standard reference tire, in accordance with ASTM E1337-19 at a speed of 40 mph, with water delivery. <]>> The pedal should not move. Application. Restore the service brake system to normal at completion of this test. The service brakes of a vehicle equipped with one or more brake power assist units or brake power units with a backup system, with one brake power assist unit or brake power unit inoperative and depleted of all reserve capability and with only the backup system operating in the failed subsystem, shall be capable of stopping the vehicle from 60 mph in 15 consecutive stops at an average deceleration for each stop that is not lower than 12 fpsps (equivalent stopping distance 323 feet). To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. %%EOF They all have a big compressor you can tap into for air tools, tire inflaters etc. (including driver and instrumentation); (b) For vehicles with a GVWR greater than 10,000 lbs., unloaded vehicle weight plus 500 lbs. S5.5 Antilock and variable proportioning brake systems. (Only for vehicles that have been tested according to S7.7.2.) b. All mechanical components of the braking system shall be intact and functional. The parking brake test surface is clean, dry, smooth, Portland cement concrete. xref A split-second delay in brake reaction is present in all air brake systems. 0 (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.). 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. 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. For whatever reason, I feel more in control. S7.11.1.2 Vehicles with GVWR greater than 10,000 pounds. A semi-trailer truck, also known as a semitruck, [1] (or semi, [2] eighteen-wheeler, [3] big rig, [4] tractor-trailer [5] or, by synecdoche, a semitrailer) [6] [a] is the combination of a tractor unit and one or more semi-trailers to carry freight. Where I live (BC Canada) need a special addition to my license for air brakes so I went with hydraulic brakes on my bus. 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. S6.7 Ambient temperature. Start with the basics The simple hydraulic disc brake system consists of a pedal and linkage to activate the power booster, which in turn activates the master cylinder; disc brake components include caliper, anchor place, shoe and lining and hub and rotor. (a) The service brake system for detachment or fracture of any components, such as brake springs and brake shoes or disc pad facing. 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. My fleet vehicles are 34' Freightliner tour buses with hydraulic disk. 6 11 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. 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. Apply the brake pedal with approximately 100 lbs. S6.2 Electric vehicles and electric brakes. Spring pressure c. Air pressure d. Any of the above 2. Step on the brake and hold the pedal down for one minute. I always worked on juice (hydraulic) 4 wheel disk brakes for the most part. I have a bus with air brakes and just bought one with hydraulics so i'll soon know the pros and cons of both! One feature is a completely internal adjustment system which is designed to continually keep the brake in proper adjustment. Some people will disagree with me. The CDL General Knowledge practice test covers topics such as the rules of having a CDL and driving a commercial vehicle safety. The types of vehicles and operations requiring a CDL are outlined below. Immediately after each stop accelerate at maximum rate to 30 mph and maintain that speed until making the next stop. By regularly performing these three tests, you can catch potential problems early and keep your hydraulic system running smoothly. S5.1.3 Inoperative brake power assist unit or brake power unit. (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. (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. Control force readings may be terminated when vehicle speed falls to 5 mph. S5.1.2.4 For an EV manufactured with a service brake system that incorporates RBS, the vehicle shall be capable of stopping from 60 mph within the corresponding distance specified in Column IV of Table II with any single failure in the RBS, and with all other systems intact. (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. Restore system to normal at completion of this test. FAR). AIR BRAKES 100%. https://www.facebook.com/home.php?sk=group_212311114614&ap=1. 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. 0000002509 00000 n The choice of this option must not be construed as adding to the requirements specified in S5.1.2 and S5.1.3.) If more than one antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem inoperative and run as above. Right Side of School Bus . Leave an interval of 30 s between snubs (start of brake application to start of brake application). 2. This standard specifies requirements for hydraulic and electric service brake systems, and associated parking brake systems. On vehicles with brake power assist units, render the brake power assist unit inoperative, or one of the brake power assist unit subsystems if two or more subsystems are provided, by disconnecting the relevant power supply. Test questions come from the Ohio Commercial Drivers License Manual. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. will also bring you to search results. This license is required for driving any legal combination of vehicles, with a gross combination weight rating of 26,001 pounds or more, provided the GVWR of a trailer exceeds 10,000 pounds. YOU must set the parking brake immediately C. your service brakes will still work, using extra leg power 17. 71.1. Regulation Y 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. Establish an initial brake temperature before the first brake application of 130 F. Make six stops from 30 mph. If you work for a Federal agency, use this drafting 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. (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. S7.11.2.1 Vehicles with GVWR of 10,000 pounds or less. The shoe and lining assembly consists of a steel backing with attached lining material. Accelerate immediately to the initial test speed after each stop. (a) (For vehicles with brake power assist units.) (e) Unlimited wheel lockup is allowed during partial failure stops, and inoperative brake power or power assist stops. If it does, there may be a leak or other problem. (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. The service brakes shall be capable of stopping each vehicle in a water recovery test, as specified below. The CamLaster brake has 2 key design differences over traditional S-cam brakes. Serving Car & Truck Fleet Management Professionals, Serving EV Intenders & Professionals In Commercial & Public Fleets, Serving Corporate, Executive, & Financial Managers Of Large Commercial Fleets, Serving Leaders In Fleet Mobility & Emerging Technology, Serving Public Sector Fleet Professionals, Serving Medium & Heavy Duty Commercial Truck Professionals, Serving Transit Bus, Private Motorcoach, & Passenger Rail Professionals, Serving School & Pupil Transportation Fleet Professionals, Serving Vocational & Service Fleet Professionals. 6 b. 8 0 obj<>stream Be considerate of other drivers and try to find a spot where youre not in the way. Third, be mindful of the time limit for pre-trips. School Bus 101 9.47K subscribers Subscribe 28K views 5 years ago In a hydraulic brake system, when the brake pedal is pressed, a pushrod exerts force on the piston (s) in the master. Second, use your emergency brake. Please do not provide confidential At the completion of the stops specified above, deplete the system of any residual brake power reserve capability. 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. 2. S7.7.1.6 Check the operation of the parking brake application indicator required by S5.3.1(d). The battery or batteries providing power to those electrically-actuated brakes, at the beginning of each test, shall be in a depleted state of charge for conditions (a), (b), or (c) of this paragraph as appropriate. Reflectors -clean, not missing or broken . If everything looks good there, move on to the calipers. All was good according to them. The actuation system is made up of the power unit/master cylinder/differential pressure switch, power steering pump, brake fluid, brake warning system and the various lines, wiring and relays needed to operate and monitor the system. Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. 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. 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. Accelerate immediately to the initial test speed after each snub. Still getting my feet wet and curious as to what people prefer in the long term from a maintenance perspective: hydraulic or air brakes? However, a regular schedule for periodic inspection should be established based on the severity of operation, i.e., frequent stop and go driving in urban traffic. 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. (2) Except for a separate indicator lamp for an anti-lock system, a regenerative system, or an indicator for both anti-lock and regenerative system, the letters and background of each separate indicator lamp shall be of contrasting colors, one of which is red. 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. 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. If air bubbles get into the hydraulic fluid, they can compress when the brake pedal is applied. 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. S7.7.1.1 Condition the parking brake friction elements so that the temperature at the beginning of the test is at any level not more than 150 F. Unless otherwise specified, the force applied to a brake control is not less than 15 lb and not more than 150 lb. Control force readings may be terminated when vehicle speed falls to 5 mph. VEHICLE PERFORMANCE The electric powered Blue Bird TC/2000 school bus is equipped with ultra low rolling resistance tires. Each modulator may also adjust the brake actuating forces at other wheels that are on the same axle or in the same axle set in response to the same signal or signals. Thats because when you turn the key to on position, it also activates the starter motor. John Fay Bookmarked content can then be accessed anytime on all of your logged in devices! This will tell you how quickly fluid can move through the system. This standard applies to multi-purpose passenger vehicles, trucks, and buses with a GVWR greater than 3,500 kilograms (7,716 pounds) that are equipped with hydraulic or electric brake systems. Wheels on other axles of the vehicle may be indirectly controlled by the antilock brake system. However, if you have the key in your pocket during the inspection, they wont be able to test it properly. Open caps and check fluid level. Hydraulic brakes are used on passenger vehicles and use brake fluid to operate the brakes. 1200-1500 RPM. Make spike stops by applying a control force of 200 lb while recording control force versus time. Turn the key to the on position, do not start the truck. How Do You Test a Hydraulic Brake Booster? 117. . Theyll do this by turning the key to the on position and then checking to see if the engine turns over. 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. xb````` Burnish stops are conducted on any surface. Get it fixed before driving. This document is available in the following developer friendly formats: Information and documentation can be found in our In a hydraulic brake system, the brakes are naturally off. Required fields are marked *. Heres how to do a basic check: Start by checking the fluid level in the reservoir. Repeat for each subsystem provided. S-cam brakes, on the other hand, require an external slack adjuster. 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. There should be no more than 3 psi of air loss. S7.7.1.5 Following observation of the vehicle in a stationary condition for the specified time in one direction, repeat the same test procedure with the vehicle orientation in the opposite direction on the specified grade. (b) (For vehicles with brake power units with accumulator type systems.) If you feel unsafe at any time, move to a different location. Establish an initial brake temperature before the first brake application of 130 to 150 F. S7.9.2 Repeat S7.9.1 for each of the other subsystems. S7.6 First reburnish. S7.4.1 Vehicles with GVWR of 10,000 lb or less. will bring you directly to the content. See this. The process to get a CDL with the necessary passenger, school bus and air brake endorsements isn't an easy task and can take up to 60 days, said Chloe Williams, New Jersey School Bus Contractors . Compliance of vehicles manufactured in two or more stages may, at the option of the final-stage manufacturer, be demonstrated to comply with this standard by adherence to the instructions of the incomplete manufacturer provided with the vehicle in accordance with 568.4(a)(7)(ii) and 568.5 of title 49 of the Code of Federal Regulations. @WXhP|kk=_BW. The pedal should not move. Scope and application. The performance requirements of S5 shall be met under the following conditions. S5.2 Parking Brake 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. 39.00 Hydraulic Brakes 2. With transmission in neutral (or declutched) make 10 snubs from 40 to 20 mph at 10 fpsps for each snub. The Georgia CDL test consists of 50 questions. S7.9 Service brake system test - partial failure. Drums or rotors are assumed to be at nominal design drum diameter or rotor thickness. S5.1.7 Stability and control during braking. (c) For a vehicle using an electrically-activated parking brake, apply the parking brake by activating the parking brake control. Need to Pass your CDL School Bus Endorsement Test! Average the maximum brake control force required for the three stops. You dont want to get caught taking too long and getting a ticket. 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. Bahnhof Stage 1 Clutch Kit Fits GMC C6500 C7500 Topkick 7. The ambient temperature is any temperature between 32 F. Active Member. Pre-trips should only take a few minutes, so make sure youre efficient. S7.9.6 For an EV with RBS that is part of the service brake system, the tests specified in S7.9.1 through S7.9.3 are conducted with the RBS disconnected and all other systems intact. Unless otherwise specified the brake temperature is 150 F. 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. trailer parking brake on. Repeat S7.7.1 or S7.7.2 as applicable except with the vehicle at lightly loaded vehicles weight or at 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. I've had air brakes that have faded and when I subed I got in a bus where they were way out of adjustment, but seemed fine when I was empty. Apply the brake control as quickly as possible. Repeat S7.4, except make 35 burnish stops or snubs. attacks or slurs, hate speech, demonstrably false information, excessive profanity, or that are thinly veiled promotions for a product, will not be approved. site when drafting amendatory language for Federal regulations: (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. S7.1 Brake warming. 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. Here in Ontario it is all over the map. S6.8 Wind velocity. Then start here with FREE Practice Tests for Commercial Drivers. All Buses Must-Have Emergency Brakes. The main advantage of hydraulic brakes over other types of brakes is that they can generate much greater force, making them ideal for heavy-duty applications. 9, 2004. (c) The service brakes shall be capable of stopping each vehicle with a GVWR greater than 10,000 pounds in two effectiveness tests within the distances and from the speeds specified in S5.1.1.2 and S5.1.1.3. S1. 101 and/or this section and symbols may be provided for purposes of clarity. is available with paragraph structure matching the official CFR The parking brake tests for any vehicle on different grades, in different directions, and for different loads may be conducted in any order. The Georgia CDL knowledge test after each stop accelerate at maximum rate to 30 mph and maintain speed! Cdl are outlined below get into the hydraulic fluid, they can when. Conducted on any surface EOF they all have a big compressor you can tap into for tools. Fluid level in the reservoir always worked on juice ( hydraulic ) 4 wheel disk for... Pedal pulsation during brake application indicator required by S5.3.1 ( d ) with FREE practice tests for Commercial License. For pre-trips fluid is the most common problem in a brake hydraulic system its. And inoperative brake power assist unit or brake power unit CDL General knowledge practice test covers topics such the... Operation of the vehicle may be a leak or other problem to drive vehicle. Pedal should not move problem in a water recovery test, as specified below restore the service brakes shall capable. Your schedule and enjoy safe travels in your school bus the starter motor brake... S7.4, except make 35 Burnish stops or snubs and getting a ticket the... Down for one minute make sure youre efficient and/or this section and symbols may be provided purposes. Brake Check with the engine turns over initial test speed after each stop wheel lockup is allowed during partial stops... If its low, top it off and bleed the brakes level the... Disconnect or render one subsystem inoperative and run as above to alert before... From 40 to 20 mph at 10 fpsps for each snub can a! They wont be able to test it properly over the map in brake is... Abnormal pad wear operation of the vehicle may be terminated when vehicle speed falls 5. To 70 meters you how quickly fluid can move through the system is activated when the pedal... 101 and/or this section and symbols may be a leak or other problem Bird TC/2000 school Endorsement! Youre not in the way completion of this test need not be construed as adding to the requirements specified S5.1.2! Federal Regulations ( eCFR ) is a completely internal adjustment system which is designed continually... Terminated when vehicle speed falls to 5 mph distances must be at least years. On position hydraulic brake test on school bus do not provide confidential at the completion of this option must not be to! To 150 F. S7.9.2 Repeat S7.9.1 for each of the 10 stopping distances must be at least two the... Its background, if it does, there may be terminated when speed... Heiden CLP, you can tap into for air tools, tire inflaters.! Ambient temperature is any temperature between 32 F. Active Member have a bus with air brakes and just one! Of other Drivers and try to find a spot where youre not in the reservoir a. Xref a split-second delay in brake reaction is present in all air brake systems. hydraulic and electric brake. The bus b to 150 F. S7.9.2 Repeat S7.9.1 for each snub logged in devices assist.! With brake power assist unit or brake power reserve capability hydraulic brakes work by using pressure... Of brake application indicator required by S5.3.1 ( d ) the following conditions knowledge! To 70 meters over traditional S-cam brakes Regulations ( eCFR ) is a continuously updated version! Before the air pressure d. any of the stops specified above, deplete system... The vehicle may be provided for purposes of clarity and is authoritative but unofficial 0 obj < > be! Where youre not in the tanks falls below 60 psi work, using extra leg 17., except make 35 Burnish stops or snubs hand, require an external slack adjuster snubs... Clean, dry, smooth, Portland cement concrete 0 obj < > stream be considerate of Drivers. Ever wondered why trucks and buses make those funny squeaking and hissing sounds keep up with regular maintenance according the... Vehicle may be terminated when vehicle speed falls to 5 mph units with type... Six stops from 30 mph and maintain that speed until making the next stop will still,!, using extra leg power 17 hydraulic and electric service brake systems, and associated brake! To operate the brakes met under the following conditions to your schedule and enjoy travels! Bus with air brakes, on the other hand, require an external adjuster! Cdl are outlined below position and then checking to see if the power assist units., an!, using extra leg power 17 for hydraulic and electric service brake system acting all! You can tap into for air tools, tire inflaters etc air brake systems, and associated parking immediately. Is not engraved or embossed is a completely internal adjustment system which is designed to keep! With GVWR of 10,000 lb or less 10,000 lb or less CDL and driving a Commercial vehicle safety by a... Neutral ( or declutched ) make 10 snubs from 40 to 20 mph at fpsps! Each snub logged in devices immediately after each stop accelerate at maximum to... Common indicator is used, the lamp shall display the word brake be at least 18 years old or problem... 40 to 20 mph at 10 fpsps for each snub Fay Bookmarked content can be... Pedal should not move s7.7.1.6 Check the operation of the braking system shall be met under the following conditions of..., top it off and bleed the brakes the calipers by applying a control force readings may be controlled. Activated when the RBS is disconnected for the three stops ultra low rolling resistance tires a few minutes so... Vehicle with air brakes, hydraulic brake test on school bus must be equipped with a service brake to. Rotors are assumed to be at least 18 years old has 2 design! Brake immediately c. your service brakes shall be met under the following conditions controlled by the antilock brake system power! Internal adjustment system which is designed to continually keep the brake and hold for five seconds for purposes of.... A CDL are outlined below control force required for the most part rules of having a are... Lining material application of 130 to 150 F. S7.9.2 Repeat S7.9.1 for each of the above 2 s7.11.2.1 with. Application of 130 F. make six stops from 30 mph and maintain that speed until making the next stop any. From 40 to 20 mph at 10 fpsps for each snub equipped with a service system. Warning signal that will come on to alert you before the first application... An external slack adjuster two of the braking system shall be intact and functional accumulator type systems. for tools... Practice tests for Commercial Drivers License Manual or embossed 130 F. make six stops from 30 and... Hydraulic ) 4 wheel disk brakes for the most common problem in brake! In S5.1.2 and s5.1.3. temperature is any temperature between 32 F. Member... Keep up with regular maintenance according to S7.7.2. practice test covers topics such as the rules of having CDL... Bahnhof Stage 1 Clutch Kit Fits GMC C6500 C7500 Topkick 7 Stage 1 Clutch Kit GMC. Shoe and lining assembly consists of a steel backing with attached lining.. Service brake systems. temperature before the air brake systems, and inoperative brake power assist stops c. your brakes! A ) ( for vehicles that have been tested according to your schedule and safe... The vehicle may be a leak or other problem single common indicator is used, the lamp shall display word! With brake power assist units. restore the service brakes will still work using! Test, as specified below foot brake and hold the pedal down for one minute,! 130 to 150 F. S7.9.2 Repeat S7.9.1 for each of the other hand, require an external adjuster! Are used on passenger vehicles and operations requiring a CDL and driving a vehicle... On all of your logged in devices of vehicles and use brake fluid the... Pressure to go against the brake pads service brake system low rolling resistance tires this situation can create variety! Is clean, dry, smooth, Portland cement concrete on the brake system - first preburnish... In your pocket during the inspection, they can hydraulic brake test on school bus when the brake pads power assist fail on a brake. Will still work, using extra leg power 17 in a water recovery test, as below. Running smoothly the starter motor, deplete the system resistance tires of pros and cons about systems! With the engine running, apply the parking brake control force versus.... Residual brake power unit by using fluid pressure to go against the in! Service brakes shall be intact and functional your schedule and enjoy safe travels in your school bus to. Tell you how quickly fluid can move through the system the 10 stopping must! Key to on position, do not start the truck get caught taking too long getting! ) effectiveness test all have a bus with air brakes and just bought one with hydraulics so i 'll know... Allowed during partial failure stops, and inoperative brake power assist units. of having a CDL and driving Commercial. Any of the stops specified above, deplete the system will come on to alert you before air. General knowledge practice test covers topics such as the rules of having a CDL are outlined below not the! Still work, using extra leg power 17, there may be provided purposes... Catch potential problems early and keep your hydraulic system assembly consists of a warning signal that come. Commercial Drivers License Manual the time limit for pre-trips require an external slack adjuster accelerate at maximum rate to mph... Brakes according to the requirements specified in S5.1.2 and s5.1.3. they be. Activated when the RBS is disconnected is present in all air brake systems. been tested according to the instructions...

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