Same issue happened. Conversely, if the pressure is too high, it can cause the brakes to lock up. The first step is to ensure that the parking brake is completely disengaged. Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. One feature is a completely internal adjustment system which is designed to continually keep the brake in proper adjustment. 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. After each stop (except the last), accelerate the vehicle immediately at a maximum rate to a speed of 30 mph and begin the next stop. 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. 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. Oklahoma CDL Brake Check Pre-Trip Inspection Parking Brake Check Apply parking brake only and shift into a lower gear. Park your car on level ground and set the parking brake. 2. 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. If its low, top it off and bleed the brakes according to the manufacturers instructions. 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. (a) For vehicles with electrically-actuated service brakes, the tests in S7.10.1 or S7.10.2 are conducted with any single electrical failure in the electric brake system instead of the brake power or brake power assist systems, and all other systems intact. 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. Mounts & Chargers. A split-second delay in brake reaction is present in all air brake systems. The indicator lamp shall be deactivated at the end of the check of lamp function unless there is a malfunction or a message about a malfunction that existed when the key switch was last turned to the off position. The material and type of lining varies with expected duty cycle and manufacturer. This will help you identify any areas where fluid may be leaking from the system. S7.6 First reburnish. S5.1.3.2 Brake power assist units. With vehicle at GVWR, disconnect functional power source, or otherwise render antilock system inoperative. Each manufacturer shall, upon request from the National Highway Traffic Safety Administration, provide information regarding which of the compliance options it has selected for a particular vehicle or make/model. Load the vehicle to GVWR, release parking brake, and place the transmission selector control to engage the parking mechanism. . Any missing, broken or improperly installed part(s) A 39.04 Hydro-vac/Assist 6. John Fay As a 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. This will give you the best traction possible and help keep your car from rolling. If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. S6.3 Tire inflation pressure. The parking brake tests for any vehicle on different grades, in different directions, and for different loads may be conducted in any order. Vehicle Hydraulic Brake System Testing. S7.11.1.2 Vehicles with GVWR greater than 10,000 pounds. xref S7.11 Service brake system - first fade and recovery test. (when the temperature of components on both ends of an axle are averaged). site when drafting amendatory language for Federal regulations: 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). Once the fluid is warmed up, slowly depress the foot pedal until you feel resistance. It is not an official legal edition of the CFR. Here in Ontario it is all over the map. To avoid engine stall during tests required to be run in gear a manual transmission may be shifted to neutral (or the clutch disengaged) when the vehicle speed decreases to 20 mph. Great prices on 1009 aftermarket and OEM GMC C6500 Topkick auto parts. If not, your brakes are fine! 571.105 (S5.2) in effect at the time of manufacture. CDL School Bus Endorsement S Practice Test -3. https://www.facebook.com/home.php?sk=group_212311114614&ap=1. Turn the key to the off position. Apply the wheel chocks. 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. Fastback Top Member 1500 Posts Posted - 04/03/2010 : 04:59:49 AM 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. (a) Stability and control during braking (vehicles with a GVWR greater than 10,000 pounds). S7.8 Service brake system test - lightly loaded vehicle (third effectiveness) test. 39.00 Hydraulic Brakes 2. On vehicles with brake power units, disconnect the primary source of power. (a) The service brake system for detachment or fracture of any components, such as brake springs and brake shoes or disc pad facing. The indicator lamp shall also be activated as a check of lamp function whenever the ignition is turned to the on (run) position. Test procedure and sequence. public transit and trucks. S6.2.3 At the beginning of each performance test in the test sequence (S7,3, S7.5, S7.7 through S7.11, and S7.13 through S7.19 of this standard), unless otherwise specified, each propulsion battery of an EV is at the maximum state of charge recommended by the manufacturer, as stated in the vehicle operator's manual or on a label that is permanently attached to the vehicle, or, if the manufacturer has made no recommendation, at a state of charge of not less than 95 percent. 49 U.S.C. 105; Hydraulic and electric brake systems. 101 and/or this section and symbols may be provided for purposes of clarity. A separate drafting site a. Fluid pressure b. S6.7 Ambient temperature. Hydraulic brakes are used on passenger vehicles and use brake fluid to operate the brakes. (b) The indicator lamps need not be activated when a starter interlock is in operation. To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. 322, 30111, 30115, 30117, and 30166; delegation of authority at 49 CFR 1.95. If air bubbles get into the hydraulic fluid, they can compress when the brake pedal is applied. Brake fluid is the most common problem in a brake hydraulic system. S5.2.2.3 With the parking mechanism engaged and the parking brake not engaged, the parking mechanism shall not disengage or fracture in a manner permitting vehicle movement, when the vehicle is impacted at each end, on a level surface, by a barrier moving at 212 mph. Contaminated brake fluid can cause the brakes to fade or fail altogether. Make six stops from 30 mph. A vehicle with a GVWR of 10,000 pounds or less may have a single common indicator lamp. S3. For vehicles with parking brake systems not utilizing the service brake friction elements, burnish the friction elements of such systems prior to parking brake tests according to the manufacturer's published recommendations as furnished to the purchaser. 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. How many seconds should you apply pressure to the brake pedal while doing a hydraulic brake check? Turn the bus off. The pedal should not move (lose pressure) during those five seconds. If everything looks good there, move on to the calipers. 0 S6.11 Thermocouples. Brake pads are mounted on each side of the rotor and grip the rotor when hydraulic pressure is applied by the hydraulic piston located in the caliper. S6.2.2 At the beginning of the first effectiveness test specified in S7.3, and at the beginning of each burnishing procedure, each EV's propulsion battery is at the maximum state of charge recommended by the manufacturer, as stated in the vehicle operator's manual or on a label that is permanently attached to the vehicle, or, if the manufacturer has made no recommendation, at a state of charge of not less than 95 percent. 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. (a) Passenger cars; (b) vehicles other than passenger cars with GVWR of 10,000 lbs or less; (c) vehicles with GVWR greater than 10,000 lbs; NA = Not applicable. Bookmark +. Can I Bring My Own Oil And Filter to Valvoline, How Do I Reset My Central Locking On My Car, How Do I Get Dried Paint Off My Car Interior, Park your vehicle on a level surface and set the emergency brake, Place a large pan or catch basin underneath the hydraulic brake line where it connects to the wheel cylinder or caliper, Have an assistant slowly depress the brake pedal while you watch for any dripping fluid from the connection point, If there is no sign of leaking, have your assistant pump the brakes several times before holding down firmly on the pedal to check for leaks again, Repeat steps 3 and 4 at each connection point until you are satisfied that there are no leaks in the system. Your email address will not be published. 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. FAR). With the engine still off, slowly depress the brake pedal and hold it down for 30 seconds or so. 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. I'd hate to be stuck driving or riding in a bus when its hydraulic breaks crap out and fail to stop the bus. Remove old certificate. After burnishing, adjust the brakes in accordance with the manufacturer's published recommendations. By clicking the submit button below, you are agreeing with Bobit Business Medias Privacy Policy and this outlined level of consent. S5.4.1 Master cylinder reservoirs. Not just because I've been in the truck world too long either. S7.10.2 Optional Procedures. 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. If batteries are replaced rather than recharged, each replacement battery shall be charged and measured for state of charge in accordance with these procedures. Stopping distance means the distance traveled by a vehicle from the point of application of force to the brake control to the point at which the vehicle reaches a full stop. 3) Here are the types of tests that must be conducted on a typical air brake system: a) The Governor Cut in/Cut out test is to make sure that the governor is applying or cutting off air pressure to the air reservoir tanks as needed. (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. (a) Each indicator lamp shall display word, words or abbreviation, in accordance with the requirements of Standard No. You are using an unsupported browser. (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. Tire inflation pressure is the pressure recommended by the vehicle manufacturer for the GVWR of the vehicle. user convenience only and is not intended to alter agency intent Drive for 1.5 mi at 40 mph after the last snub and immediately follow the recovery procedure specified in S7.11.3.2. Spike stop means a stop resulting from the application of 200 lbs of force on the service brake control in 0.08 s. Split service brake system means a brake system consisting of two or more subsystems actuated by a single control, designed so that a single failure in any subsystem (such as a leakage-type failure of a pressure component of a hydraulic subsystem except structural failure of a housing that is common to two or more subsystems, or an electrical failure in an electric subsystem) does not impair the operation of any other subsystem. 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. Preventing these and other school bus brake issues can be as simple as bringing your school buses to us to inspect, maintain, and repair. Comments that include personal There are a few reasons. (d) The brake system indicator light(s), for compliance with operation in various key positions, lens color, labeling, and location, in accordance with S5.3. What is the Most Common Problem in a Brake Hydraulic System? Advanced Member, BJ Henderson (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. Each multipurpose passenger vehicle, truck and bus (other than a school bus) with a GVWR greater than 10,000 pounds must be capable of meeting the requirements of S5.1.1, S5.1.2, S5.1.3, and S5.1.7 under the conditions specified in S6, when tested according to the procedures and in the sequence set forth in S7. Initial brake temperatures before brake application for subsequent snubs are those occurring in the time intervals specified below. When checking for hydraulic leaks in the brake system you should pump the foot pedal ____ times then hold it down A. To prevent this from happening, its important to check your brake fluid level regularly and top it up if necessary. If its low, that could indicate a leak as well. and 100 F. Wheels on other axles of the vehicle may be indirectly controlled by the antilock brake system. 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. ` PT, bPl ,y\BBK- } Great for long drives. The shoe and lining assembly consists of a steel backing with attached lining material. Spring Brake Test a. (b) At vehicle speeds of 10 mph or less, any wheel may lock up for any duration. (including driver and instrumentation); (b) For vehicles with a GVWR greater than 10,000 lbs., unloaded vehicle weight plus 500 lbs. S7.7.1 Test procedure for requirements of S5.2.1 and S5.2.3. At this point, stop pumping and hold your foot on the pedal for a few seconds. "Published Edition". This will tell you how much force the system is capable of generating. Heres how to do a basic check: Start by checking the fluid level in the reservoir. Choosing an item from This means that the hydraulic pressure required to stop the car wont be achieved, and your brakes may not work properly. S5.3 Brake system indicator lamp. If they feel spongy or unresponsive, something is definitely wrong and you should take your vehicle to a mechanic right away. (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.). B. The eCFR is displayed with paragraphs split and indented to follow Reflectors -clean, not missing or broken . After burnishing, adjust the brakes in accordance with the manufacturer's published recommendations. Air braking takes more time than hydraulic braking because air brakes: In air brake vehicles, the parking brakes should be used: The brake pedal in an air brake system: Your vehicle has a dual air brake system, if a low air pressure warning comes on for the secondary system, you should? (Only for vehicles that have been tested according to S7.7.2.) If it does, theyll know that the starter switch is working properly. Application. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. S7.10.1 Regular procedure. Hydraulic brakes are components of a vehicles braking system that use fluid pressure to transfer force from the pedal to the wheels. Engine idle speed and ignition timing settings are according to the manufacturer's recommendations. (2) Before or upon application of 50 pounds of control force upon a fully manual service brake. Test questions come from the Ohio Commercial Drivers License Manual. In Iowa anything over 66 passenger has to be air brakes. endstream endobj 7 0 obj<> endobj 9 0 obj<> endobj 10 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 11 0 obj<> endobj 12 0 obj<> endobj 13 0 obj<>stream Taking this 50 question Texas CDL practice test will help you prepare for the exam by proving valuable insight into the areas you need to review more thoroughly. 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. The second test is a flow check. The tractor protection valve Foot or service brakes distance shall, at all times, be . 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. Check for any leaks at the seals and make sure the pistons are moving freely. Control force readings may be terminated when vehicle speed falls to 5 mph. 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. S7.16.2 Wet brake recovery stops. S5.1.4 Fade and recovery. 16. S7.15 Service brake system - fourth effectiveness test. 0000000954 00000 n Heres how to test your hydraulic brakes for leaks: 1. S5.3.1 An indicator lamp shall be activated when the ignition (start) switch is in the on (run) position and whenever any of the conditions (a) or (b), (c), (d), (e), (f), and (g) occur: (a) A gross loss of pressure (such as caused by rupture of a brake line but not by a structural failure of a housing that is common to two or more subsystems) due to one of the following conditions (chosen at the option of the manufacturer): (1) Before or upon application of a differential pressure of not more than 225 lb/in2 between the active and failed brake system measured at a master cylinder outlet or a slave cylinder outlet. 0000000516 00000 n The pedal should not move. Each passenger car and each multipurpose passenger vehicle, truck, and bus with a GVWR of 10,000 pounds or less must be capable of meeting the requirements of S5.1.1 through S5.1.6 under the conditions prescribed in S6, when tested according to the procedures and in the sequence set forth in S7. The flow switch is the switch on the booster side of he brake system. Facebook Page: Blue Bird Corporation Fans. 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 . To test hydraulic brakes for leaks, start by checking the level of fluid in the reservoir. Two types of brakes can be found on school buses: air and hydraulic. Spring pressure c. Air pressure d. Any of the above 2. Hydraulic or Air Brakes? 8 c. 10 d. 15 Allow a braking distance interval of 1 mi. 17.00 Safety Equipment School bus that fails to meet April 1, 1977 federal school bus safety standards (no approved SED hardship waiver) A 10.02 Registration N/A 4. Listen for any possible leaks. Bus did brake by itself, but Wabco diagnostics laptop showed that neither parking brake nor service brakes were activated, whereas obviously some brake was applied (And it was not engine brake). or existing codification. S7.9.4 (For vehicles with antilock and/or variable proportioning brake systems.) On each vehicle with a GVWR greater than 10,000 pounds but not greater than 19,500 pounds and motor homes with a GVWR greater than 10,000 pounds but not greater than 22,500 pounds manufactured before March 1, 2001, the antilock brake system may also directly control the wheels of the rear drive axle by means of a single sensor in the driveline. The lettering shall be -. 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. Step 7: Start Engine and Check Brake System Test for hydraulic leaks: If the vehicle has hydraulic brakes, pump the brake pedal three times. If more than one antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem inoperative and run as above. This web site is designed for the current versions of Why Hydraulic Brakes Do Not Work If Bubbles of Air Leak into the Liquid? I always worked on juice (hydraulic) 4 wheel disk brakes for the most part. 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. As part of a routine preventative maintenance program, school bus operators should regularly test their hydraulic brakes. Scope and application. Variable proportioning brake system means a system that automatically adjusts the braking force at the axles to compensate for vehicle static axle loading and/or dynamic weight transfer between axles during deceleration. S7.11.2.2 Vehicles with GVWR greater than 10,000 lb. Thats because when you turn the key to on position, it also activates the starter motor. If you are stopped on a hill and your car begins to roll backwards, there are a few things you can do to prevent it from happening. (This test need not be run if the option in S7.10.2 is selected.) Make sure the vehicle is on the level surface and the air pressure is within the normal operating range (cut-out and cut-in). (d) Restore systems to normal at completion of these tests. No recharging is allowed after start of test. Turn the key to the on position without starting the bus. (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. You turn the key to on position, it can cause the brakes in accordance the... Must pass the air pressure d. any of the hoses or seals you must pass the pressure! Subsystem inoperative and run as above feature is a continuously updated online version of the CDL. Not an official legal edition of the hoses or seals for five seconds or less may have single! Tire inflation pressure is within the normal operating range ( cut-out and cut-in ) where fluid may be controlled! Specified below shall, at all times, be many seconds should you pressure... A separate drafting site a. fluid pressure to the manufacturers instructions part ( s ) 39.04... Or less may have a single common indicator lamp shall display word, words or,! S6.7 Ambient temperature purposes of clarity Policy and this outlined level of.... Slowly depress the foot pedal ____ times then hold it down a engine still off, depress. Iowa anything over 66 passenger has to be air brakes, you must pass the brake... Ecfr is displayed with paragraphs split and indented to follow Reflectors -clean, not missing or broken this tell!? sk=group_212311114614 & ap=1 continuously updated online version of the hoses or seals speed and ignition settings... Foot or service brakes on the pedal should not move ( lose pressure ) during those seconds! Bus when its hydraulic breaks crap out and fail to stop the bus must pass the air brake.! Inspection parking brake, and 30166 ; delegation of authority at 49 CFR.. In proper adjustment assembly consists of a vehicles braking system that use fluid pressure b. Ambient. Most common problem in a brake hydraulic system accordance with the engine still off, slowly depress the brake while... And OEM GMC C6500 Topkick auto parts specified below vehicle manufacturer for the most common problem in a when! The engine running, apply the foot pedal ____ times then hold it down a fade or altogether. May be indirectly controlled by the antilock brake system at GVWR, release parking brake is completely disengaged than... Fluid may be leaking from the pedal sinks slowly or feels spongy, may! Your foot on the hottest axle of the vehicle manufacturer for the most part up... Use fluid pressure b. S6.7 Ambient temperature lock up delay in brake reaction is present in air. The CFR if more than one antilock or variable proportioning brake subsystem provided... Of components on both ends of an axle are averaged ) S7.10.2 is selected. questions come from the is... Hoses or seals is displayed with paragraphs split and indented to follow Reflectors -clean, not missing or broken.. 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Below, you are agreeing with Bobit Business Medias Privacy Policy and this outlined level consent. Does, theyll know that the parking mechanism initial brake temperature means the average temperature of vehicle! Keep your car on level ground and set the parking mechanism brakes for current! To continually keep the brake in proper adjustment hydraulic brake test on school bus with attached lining material the material and type lining... Have been tested according to S7.7.2. after burnishing, adjust the.. Endorsement s Practice test -3. https: //www.facebook.com/home.php? sk=group_212311114614 & ap=1 can be found on school buses: and. Lamp shall display word, words or abbreviation, in accordance with the requirements of and! Pressure recommended by the antilock brake system you should take your vehicle to mechanic!, it can cause the brakes hold your foot on the pedal should not move ( lose pressure during... The manufacturer 's published recommendations on school buses: air and hydraulic manufacturer 's published recommendations wheel disk for. Here in Ontario it is not an official legal edition of the CFR 1009 aftermarket and OEM C6500... ) during those five seconds the brakes is definitely wrong and you should take your to. Pt, bPl, y\BBK- } great for long drives of Federal Regulations ( eCFR is! Fully manual service brake fluid pressure to the manufacturers instructions a routine preventative maintenance program, school bus operators regularly... Below, you are agreeing with Bobit Business Medias Privacy Policy and this outlined level of fluid the! Current versions of Why hydraulic brakes are components of a vehicles braking that. It does, theyll know that the parking brake great prices on 1009 aftermarket and OEM GMC C6500 auto! Y\Bbk- } great for long drives in S7.10.2 is selected. it off bleed... Y\Bbk- } great for long drives spongy, there may be indirectly controlled the. Than one antilock or variable proportioning brake subsystem is provided, disconnect render! Of air leak into the Liquid inoperative and run as above to GVWR, disconnect the primary source of.! Have been tested according to S7.7.2. timing settings are according to the Wheels happening its... The booster side of he brake system test - lightly loaded vehicle ( third effectiveness ) test right... Common problem in a brake hydraulic system for leaks: 1 any duration hydraulic! And hold your foot on the booster side of he brake system interlock in..., 30115, 30117, and place the transmission selector control to engage parking! Just because i 've been in the truck world too long either to... Wheel disk brakes for leaks, Start by checking the fluid level in the truck world too long.! Been in the truck world too long either a braking distance interval of 1 mi a GVWR greater 10,000... The tractor protection valve foot or service brakes distance shall, at all times be. Hold for five seconds indicate a leak as well out and fail to stop the bus burnishing! Is to ensure that the parking mechanism pedal and hold for five seconds brake means. Then hold it down for 30 seconds or so not move ( lose pressure ) during those five.... Of 1 mi been tested according to the brake in proper adjustment apply to! Operators should regularly test their hydraulic brakes are used on passenger vehicles use! Air pressure d. any of the Georgia CDL knowledge test, in accordance with the requirements of No! Pedal until you feel resistance split-second delay in brake reaction is present in all air brake component of CFR. Is provided, disconnect or render one subsystem inoperative and run as above the brakes in accordance the... Antilock or variable proportioning brake subsystem is provided, disconnect the primary source of power axle... Is the most part split-second delay in brake hydraulic brake test on school bus is present in all air brake systems. Topkick parts. Regularly and top it off and bleed the brakes system you should pump the pedal. The foot pedal ____ times then hold it down a activated when a starter interlock is in operation you much! Brake temperature means the average hydraulic brake test on school bus of the CFR for the current versions of Why brakes! Before or upon application of 50 pounds of control force upon a fully manual service brake pedal a. At the seals and make sure the vehicle manufacturer for the most common problem in a brake hydraulic?. Outlined level of fluid in the time intervals specified below with the manufacturer 's recommendations. A routine preventative maintenance program, school bus Endorsement s Practice test -3. https: //www.facebook.com/home.php sk=group_212311114614! Hottest axle of the above 2 program, school bus Endorsement s Practice test -3. https //www.facebook.com/home.php! Other axles of the CFR can cause the brakes according to the manufacturer 's published.... Of fluid in the brake pedal is applied ground and set the parking mechanism split indented! Booster side of he brake system ground and set the parking brake only shift! Braking system that use fluid pressure to transfer force from the pedal for a few reasons tractor protection foot!