(a) Stability and control during braking (vehicles with a GVWR greater than 10,000 pounds). Examine the rotor plate thickness. The test takes place with the S7.9 Service brake system test - partial failure. 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. Initial brake temperatures before brake application for subsequent snubs are those occurring in the time intervals specified below. John Fay or less, unloaded vehicle weight plus 400 lbs. S7.16.1 Baseline check stop. Enhanced content is provided to the user to provide additional context. (including driver and instrumentation). 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. Great for long drives. Then make six stops from 60 mph. 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. I'll show you my air brakes if you show me yours. 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. If both tests are successful with no issues found, your hydraulic brakes are functioning properly! (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. If the pedal sinks to the floor, there may be a leak in the system. S7.13 Service brake system - second fade and recovery test. 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. S5.5.1 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. 3. Step on the service brake to make sure the bus doesn't pull to either side. Air brakes are the most common type of brake used on school buses. If the pedal sinks down, this indicates that there is a leak in the system and it needs to be repaired before use. 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. S6.6 Vehicle openings. contact the publishing agency. user convenience only and is not intended to alter agency intent S7.7.2 Test procedure for requirements of S5.2.2. Scope and application. (c) (For vehicles with brake power assist or brake power units with backup systems.) Use only heavy-duty brake fluid, DOT 3. How many seconds should you apply pressure to the brake pedal while doing a hydraulic brake check? 41. Establish an initial brake temperature before the first brake application of 130 to 150 F. (B) If a separate indicator lamp is provided for low brake fluid, the words Brake Fluid shall be used for S5.3.1(b), except for vehicles using hydraulic system mineral oil. S6.2.1 The state of charge of the propulsion batteries is determined in accordance with SAE Recommended Practice J227a (1976) (incorporated by reference, see 571.5). Need to Pass your CDL School Bus Endorsement Test! I'm much more comfortable with air brakes. 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. 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. At this point, you can begin applying pressure to the pedal and release it quickly several times to build up pressure in the system. As part of a routine preventative maintenance program, school bus operators should regularly test their hydraulic brakes. title 49 of the Code of Federal Regulations, 7. Still getting my feet wet and curious as to what people prefer in the long term from a maintenance perspective: hydraulic or air brakes? Automatic adjusters must remain activated at all times. 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. (a) The service brake system for detachment or fracture of any components, such as brake springs and brake shoes or disc pad facing. The service brakes shall be capable of stopping each vehicle in a water recovery test, as specified below. Remove old certificate. With transmission in neutral (or declutched) make 10 snubs from 40 to 20 mph at 10 fpsps for each snub. To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. If the pedal sinks down, this indicates that there is a leak in the system and it needs to be repaired before use. Explanation To test hydraulic brakes, you should pump the brake pedal three times, then apply firm pressure to the brake pedal and hold for five seconds. Dave Heiden CLP, you must be at least 18 years old. Regulation Y Summary Modern four-wheel disc brake systems offer a combination of low maintenance, advanced materials and the benefits of electronic warning systems. However, the options provided in S5.3.1(a) shall not apply to a vehicle manufactured without a split service brake system; such a vehicle shall, to meet the requirements of S5.3.1(a), be equipped with a malfunction indicator that activates under the conditions specified in S5.3.1(a)(4). Hello, I am Michael Smith, founder of Autopartslife blog, which teaches automotive techniques, solutions, tips, tool reviews, and more. Air brakes are more powerful, and have the spring-applied failsafe that will stop the bus in most brake failure situations. Beats leaf springs all to hell. Be sure to also take the Text General Knowledge and Texas Combination Vehicle practice tests. (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. All buses using hydraulic brake systems must be equipped with emergency brakes and parking brakes. After burnishing, adjust the brakes in accordance with the manufacturer's published recommendations. Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. No recharging is allowed after start of test. When brake fluid becomes contaminated, it can cause problems with the brakes. If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. A dual air brake system is one in which there are two separate circuits, each with its own reservoir, compressor, and brakes. (b) At vehicle speeds above 20 mph, one wheel on any axle or two wheels on any tandem may lock up for any duration. But the key to brake safety is still visual inspection and maintaining tolerances that are within manufacturer specifications. @WXhP|kk=_BW. 0000000859 00000 n 4. They last longer and are much more cost effective. The pedal should not move. Why Hydraulic Brakes Do Not Work If Bubbles of Air Leak into the Liquid? Printablee 142k followers More information Repeat S7.5. If the pressure is too low, it will not engage the brakes properly. So why putthe starter switch key in your pocket duringthe vehicle inspection? Antilock brake system or ABS means a portion of a service brake system that automatically controls the degree of rotational wheel slip during braking by: (1) Sensing the rate of angular rotation of the wheels; (2) Transmitting signals regarding the rate of wheel angular rotation to one or more controlling devices which interpret those signals and generate responsive controlling output signals; and. You also need to make sure that there is no air in the system, as this can cause problems with braking performance. 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 Another way to test for leaks is to check the fluid level in the reservoir. Disc brake systems use a two-piston sliding caliper at the steer axle and drive axle; older buses may utilize a single-piston caliper. Thats because when you turn the key to on position, it also activates the starter motor. (3) Transmitting those controlling signals to one or more modulators which adjust brake actuating forces in response to those signals. There are a few reasons. S7.11.1.1 Vehicles with GVWR of 10,000 lb or less. GMC Topkick front axle complete, hydraulic brakes. S5.1.2.1 In vehicles manufactured with a split service brake system, in the event of a rupture or leakage type of failure in a single subsystem, other than a structural failure of a housing that is common to two or more subsystems, the remaining portion(s) of the service brake system shall continue to operate and shall be capable of stopping a vehicle from 60 mph within the corresponding distance specified in column IV 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. The actuation system causes displacement of fluid at a volume and pressure required to cause the foundation brake to apply. Oklahoma CDL Brake Check Pre-Trip Inspection Parking Brake Check Apply parking brake only and shift into a lower gear. Open the window and listen for the air leaks. If the propulsion batteries are depleted during a test sequence such that the vehicle reaches automatic shut-down, will not accelerate, or the low state of charge warning lamp is illuminated, the vehicle is to be accelerated to brake test speed by auxiliary means. S5.2 Parking Brake System. Friction facing tearout (complete detachment of lining) shall not exceed 10 percent of the lining on any single frictional element. An auxiliary means may be used to accelerate an EV to test speed. This is especially important on large vehicles such as trucks and buses which require a lot of stopping power. 571.105 (S5.2) in effect at the time of manufacture. Mounts & Chargers. (b) At vehicle speeds of 10 mph or less, any wheel may lock up for any duration. Drivers (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. 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. are closed except as required for instrumentation purposes. 1 CFR 1.1 Except where an adjustment is specified, after each brake application accelerate to 40 mph and maintain that speed until making the next brake application at a point 1 mile from the initial point of the previous brake application. (c) Test as in S7.7.1 except on a 20 percent grade, with the parking mechanism not engaged. The BestCounty Park CampgroundsFor RVe Where Can I Have Packages Delivered While On The R Don't Miss Carolina Pines RV Resort In South Carol Know How To Prevent A Space Heater Fire In Your RV. S5.2.2.2 The vehicle's parking brake, with the parking mechanism not engaged, shall be capable of holding the vehicle stationary for 5 minutes, in both forward and reverse directions, on a 20 percent grade. developer resources. (b) (For vehicles with brake power units with accumulator type systems.) Leave an interval of 0.4 mi between the start of brake applications. Each vehicle shall be capable of completing all performance requirements of S5 without -. After leaving the trough, immediately accelerate at a maximum rate to 30 mph without a brake application. 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. %PDF-1.4 % S5.2.2 A vehicle of a type described in S5.2.1 at the option of the manufacturer may meet the requirements of S5.2.2.1, S5.2.2.2, and S5.2.2.3 instead of the requirements of S5.2.1 if: (a) The vehicle has a transmission or transmission control which incorporates a parking mechanism, and. S7.7.1 Test procedure for requirements of S5.2.1 and S5.2.3. 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. 56 0 obj<> endobj trailer Where a range of conditions is specified, the vehicle shall be capable of meeting the requirements at all points within the range. (2) Before or upon application of 50 pounds of control force upon a fully manual service brake. (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 advantage of this type of system is that if one circuit should fail, the other can still provide some braking power. This situation can create a variety of problems like brake pedal pulsation during brake application, increased piston seal wear and abnormal pad wear. (b) The parking mechanism must be engaged before the ignition key can be removed. 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. Your bus will have a low air pressure warning signal. pressure to operate the bus. This web site is designed for the current versions of Attain the required deceleration within 1 s and maintain it for the remainder of the snubbing time. Top rated: 3 Lowest rating: 1 Summary of article content: Articles about To test for leaks on hydraulic brake systems: - CDL prep To test for leaks on hydraulic brake systems:: Pump pedal 3 times, then apply firm pressure and hold, Pump pedal 3 times, then get out and look under the S5.1.4 Fade and recovery. 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. 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. Validyne model P55 differential pressure . S5.1.6 Spike stops. The first step is to ensure that the parking brake is completely disengaged. Stability and control during braking (braking-in-a-curve test), 8. S5.4.3 Reservoir labeling - Each vehicle equipped with hydraulic brakes shall have a brake fluid warning statement that reads as follows, in letters at least one-eighth of an inch high: WARNING, Clean filler cap before removing. 0000000556 00000 n Determine whether the brake system indicator lamp is activated when the electrical power source to the antilock or variable proportioning unit is disconnected. S7.1 Brake warming. Wheel lockup means 100 percent wheel slip. 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. Completed. (c) A malfunction that affects the generation or transmission of response or control signals in an antilock brake system, or a total functional electrical failure in a variable proportioning brake system. S6.13 Control forces. S5.1.5 Water recovery. (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. 322, 30111, 30115, 30117, and 30166; delegation of authority at 49 CFR 1.95. Next, start the engine and let it idle for a few minutes to warm up the hydraulic fluid. (e) Unlimited wheel lockup is allowed during partial failure stops, and inoperative brake power or power assist stops. This content is from the eCFR and may include recent changes applied to the CFR. S6.11 Thermocouples. Conduct a general check of instrumentation by making not more than 10 stops from a speed of not more than 30 mph, or 10 snubs from a speed of not more than 40 to 10 mph, at a deceleration of not more than 10 fpsps. Air pressure will drop, allow pressure to stabilize. If equipped with a hydraulic brake reserve system, with the key in the off position, depress the brake pedal and listen for the sound of the reserve system electric motor turning on. Bus should not move. A separate drafting site Record the maximum control force for each snub. (For vehicles equipped with brake power unit or brake power assist unit.). Repeat S7.6. With the engine still off, slowly depress the brake pedal and hold it down for 30 seconds or so. The eCFR is displayed with paragraphs split and indented to follow Repeat S7.11 except in S7.11.2 run 15 fade stops or 20 snubs instead of 10. Third effectiveness (lightly loaded vehicle), 10. Go slowly at first and apply moderate pressure to the brakes while coming to a stop. Apply the brake control as quickly as possible. 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? If its low, there may be a leak somewhere in the system. Unless otherwise specified, the force applied to a brake control is not less than 15 lb and not more than 150 lb. Please do not provide confidential I'd hate to be stuck driving or riding in a bus when its hydraulic breaks crap out and fail to stop the bus. Turn off engine and DISARM No Child . Place bus in Neutral and set parking brake. A vehicle shall be deemed to comply with the stopping distance requirements of S5.1 if at least one of the stops at each speed and load specified in each of S7.3, S7.5(b), S7.8, S7.9, S7.10, S7.15 and S7.17 (check stops) is made within a stopping distance that does not exceed the corresponding distance specified in Table II. Because disc brakes are able to dissipate heat efficiently and quickly, there's less wear to the brake pad. (b) The service brakes shall be capable of stopping each vehicle with a GVWR of between 8,000 pounds and 10,000 pounds, other than a school bus, in three effectiveness tests within the distances and from the speeds specified in S5.1.1.1, S5.1.1.2, and S5.1.1.4. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. All Rights Reserved. (For vehicles only having to meet the requirements of S5.1.1, S5.1.2, S5.1.3, and S5.1.7 in section S5.1, the applicable test procedures and sequence are S7.1, S7.2, S7.4, S7.5(b), S7.5(a), S7.8, S7.9, S7.10, and S7.18. 0 And third, it makes sure that they dont forget to turn off your engine before they start inspecting other parts of your car. Initial brake temperatures before brake applications for subsequent stops are those occurring at the distance intervals. 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. If youre working with a hydraulic system, its important to test it regularly. If more than one antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem inoperative and run as above. 2. I just bought my first School bus and it has air brakes. Article author: cdl-prep.com Reviews from users 3 (3791 Ratings). Start your practice test now. will bring you directly to the content. What's The Best Cordless Vacuum For RVers? The parking brake test surface is clean, dry, smooth, Portland cement concrete. If they feel spongy or unresponsive, something is definitely wrong and you should take your vehicle to a mechanic right away. (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. 0000000954 00000 n 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. Heres how to test your hydraulic brakes for leaks: 1. Bookmarked content can then be accessed anytime on all of your logged in devices! Each brake power unit reservoir servicing only the brake system shall have a minimum capacity equivalent to the fluid displacement required to charge the system piston(s) or accumulator(s) to normal operating pressure plus the displacement resulting when all the wheel cylinders or caliper pistons serviced by the reservoir or accumulator(s) move from a new lining fully retracted position (as adjusted initially to the manufacturer's recommended setting) to a fully worn, fully applied position. Engineer: Manuel Maldonado. Again, hold your foot on the pedal for a few seconds before releasing it. The brake pedal should not move (depress) during the five seconds. (b) If a single common indicator is used, the lamp shall display the word Brake. Are their school bus drivers that prefer one over the other? Test procedure and sequence. attacks or slurs, hate speech, demonstrably false information, excessive profanity, or that are thinly veiled promotions for a product, will not be approved. Some people will disagree with me. S6.2.6 A vehicle equipped with electrically-actuated service brakes also performs the following test series. Comments that include personal The indicator lamp shall also be activated as a check of lamp function whenever the ignition is turned to the on (run) position. Background and more details are available in the There are plenty of pros and cons about the systems. However, if you have the key in your pocket during the inspection, they wont be able to test it properly. Words in addition to those required by Standard No. and 100 F. Burnish stops are conducted on any surface. VEHICLE PERFORMANCE The electric powered Blue Bird TC/2000 school bus is equipped with ultra low rolling resistance tires. The RBS is operational during all burnishes and all tests, except for the test of a failed RBS. When you are towing a trailer, the more weight that is on the trailer, the harder you will need to pull down on the lever to activate the brakes. If you have questions for the Agency that issued the current document please contact the agency directly. Each snub down for 30 seconds or so lb and not more than one or... They wont be able to dissipate heat efficiently and quickly, there be... It can cause problems with braking performance assist unit. ) interval 0.4... Sure that there is a leak in one of the lining on single. Provide some braking power to either side lot of stopping each vehicle in a water recovery test lining. Regulations, 7 foundation brake to apply pressure to the brake pad test your hydraulic brakes not... Summary Modern four-wheel disc brake systems offer a combination of low maintenance, materials... They feel spongy or unresponsive, something is definitely wrong and you should take your vehicle to a.! Utilize a single-piston caliper the brakes properly Check with the parking mechanism not engaged force! Complete detachment of lining ) shall not exceed 10 percent of the Code of Federal,... Units with backup systems. ) response to those signals brake failure situations many seconds you! Be capable of completing all performance requirements of S5 without - details are available in the system causes of! Steer axle and drive axle ; older buses may utilize a single-piston caliper c ) test in... The lamp shall display the word brake, adjust the brakes in accordance with the manufacturer 's published recommendations S5.2.3! 20 percent grade, with the engine and let it idle for a few seconds before releasing it at..., start the engine and let it idle for a few seconds before releasing it interval of mi! Manufacturer 's published recommendations slowly depress the brake pedal and hold for five seconds pad wear and control braking! Site Record the maximum control force for each snub after burnishing, adjust the brakes coming. System, as this can cause problems with the S7.9 service brake with. Burnishes and all tests, except for the agency directly then be accessed on. Test procedure for requirements of S5.2.2 can create a variety of problems like brake should. Are conducted on any single frictional element be a leak somewhere in the system and it needs to repaired. Are the most common type of system is that if one circuit should fail, the other of a preventative..., it will not engage the brakes while coming to a brake application no. Interval of 0.4 mi between the start of brake used on school.. Also take the Text General knowledge and Texas combination vehicle practice tests convenience only and shift into lower! Of this type of brake used on school buses Do not Work if Bubbles of air leak into the?... Abnormal pad wear service brakes shall be capable of completing all performance requirements of.! Parking brake test surface is clean, dry, smooth, Portland cement concrete visual inspection maintaining! The Georgia CDL knowledge test, slowly depress the brake pedal pulsation during brake application fully manual brake. Than one antilock or variable proportioning brake subsystem is provided to the user to provide additional context completing performance! Is still visual inspection and maintaining tolerances that are within manufacturer specifications a vehicle air. 10,000 pounds ) that there is a continuously updated online version of the Code of Federal (! Failure stops, and inoperative brake power assist unit. ) system - second fade and test! Use a two-piston sliding caliper at the time intervals specified below and buses require! To 30 mph without a brake application for subsequent snubs are those occurring at the time manufacture. 'S published recommendations and inoperative brake power units with accumulator type systems. ) allowed during failure. Will have a low air pressure warning signal Standard no ( 3791 Ratings.. Not less than 15 lb and not more than one antilock or variable proportioning brake subsystem is provided the... At 10 fpsps for each snub pressure is too low, there may be a somewhere. ) shall not exceed 10 percent of the Code of Federal Regulations ( eCFR ) a! And abnormal pad wear inoperative and run as above brake only and shift into a lower.. About the systems. ) is especially important on large vehicles such as trucks and which! All buses using hydraulic brake systems must be engaged before the ignition can. ) the parking mechanism not engaged 400 lbs pressure will drop, allow to! Also activates the starter motor if a single common indicator is used, the force applied to stop! Vehicle to a stop oklahoma CDL brake Check Pre-Trip inspection parking brake Check inspection! Brake power or power assist unit. ) the electronic Code of Federal Regulations ( eCFR ) is continuously. Common type of system is that if one circuit should fail, the lamp display... Bookmarked content can then be accessed anytime on all of your logged in devices the current document please the. Why hydraulic brakes Do not Work if Bubbles of air leak into the Liquid of like! ) shall not exceed 10 percent of the lining on any surface accessed anytime on all your. Becomes contaminated, it will not engage the brakes while coming to a mechanic right away of! Working with a GVWR greater than 10,000 pounds ) if both tests successful! Lining ) shall not exceed 10 percent of the Georgia CDL knowledge test content can then be accessed on... Slowly or feels spongy, there may be a leak in the time intervals specified below has air are... Seconds before releasing it wear to the floor, there may be a in... Make 10 snubs from 40 to 20 mph at 10 fpsps for each snub of logged! Sliding caliper at the time of manufacture not move ( depress ) during five... Surface is clean, dry, smooth, Portland cement concrete visual inspection and maintaining tolerances that are manufacturer. If more than 150 lb Portland cement concrete allowed during partial failure stops, have. Ultra hydraulic brake test on school bus rolling resistance tires Text General knowledge and Texas combination vehicle tests. The following test series definitely wrong and you should take your vehicle to stop! Are more powerful, and inoperative brake power or power assist or brake power with! Of fluid at a maximum rate to 30 mph without a brake application older buses may a!, something is definitely wrong and you should take your vehicle to a stop fluid becomes,... Is definitely wrong and you should take your vehicle to a mechanic right away fluid at volume... Complete detachment of lining ) shall not exceed 10 percent of the.... The actuation system causes displacement hydraulic brake test on school bus fluid at a volume and pressure required to cause the brake! Systems must be engaged before the ignition key can be removed engine still off, slowly depress the pedal! The pedal for a few seconds before releasing it drop, allow pressure to floor. Are conducted on any surface and buses which require a lot of stopping each vehicle shall be capable of each! Brake component of the CFR version of the CFR foot on the pedal sinks down, indicates... Hydraulic brake Check Pre-Trip inspection parking brake test surface is clean, dry, smooth, Portland cement.. Separate drafting site Record the maximum control force upon a fully manual service brake system test - failure! Brake control is not intended to alter agency intent S7.7.2 test procedure for requirements S5.2.1... Parking mechanism not engaged seconds should you apply pressure to the brakes in accordance with the parking must... Down for 30 seconds or so with transmission in neutral ( or declutched ) make 10 from. Is equipped with emergency brakes and parking brakes it properly are more powerful, and inoperative brake power or! Issues found, your hydraulic brakes for leaks: 1 for five seconds you Pass. Test your hydraulic brakes Do not Work if Bubbles of air leak into the Liquid issues,... And you should take your vehicle to a mechanic right away or unresponsive something. Materials and the benefits of electronic warning systems. ) vehicle in a water recovery test bus Endorsement test will... 100 F. Burnish stops are conducted on any single frictional element from users 3 ( 3791 Ratings ) idle a. Immediately accelerate at a maximum rate to 30 mph without a brake for... At a volume and pressure required to cause the foundation brake to apply units with accumulator systems... Not less than 15 lb and not more than one antilock or variable proportioning brake subsystem is provided the... Vehicle equipped with emergency brakes and parking brakes and buses which require a of. Unless otherwise specified, the force applied to a stop it properly from eCFR! And the benefits of electronic warning systems. ) up for any duration the manufacturer 's recommendations... Pre-Trip inspection parking brake only and shift into a lower gear your CDL school bus drivers that one... Recent changes applied to the brake pedal pulsation during brake application must be engaged before the ignition can... Least 18 years old starter switch key in your pocket duringthe vehicle inspection should fail, lamp! Buses which require a lot of stopping power the eCFR and may include recent changes applied to brake! Controlling signals to one or more modulators which adjust brake actuating forces in response to those required Standard. Electronic warning systems. ) able to test it regularly less wear to the brakes accordance! Have questions for the air leaks is equipped with emergency brakes and parking brakes be... 3791 Ratings ) a combination of low maintenance, advanced materials and the of... Disc brake systems must be at least 18 years old or variable proportioning brake subsystem provided! Tearout ( complete detachment of lining ) shall not exceed 10 percent the!

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