S7.11.1.1 Vehicles with GVWR of 10,000 lb or less. It keeps kids more active. 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. HW[sF~eWJe! Splash Guards/Mud Flaps - mounted, not damaged . 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. S5.1.5.1 The control force used for the baseline check stops or snubs shall be not less than 10 pounds, nor more than 60 pounds, except that the control force for a vehicle with a GVWR of 10,000 pounds or more may be between 10 and 90 pounds. will bring you directly to the content. The advantage of this type of system is that if one circuit should fail, the other can still provide some braking power. 2023 School Bus Fleet Magazine, Bobit. While your buses are here, our mechanics can: Inspect the condition of the brake lining. Completed. The vehicle is aligned in the center of the roadway at the start of each brake application. title 49 of the Code of Federal Regulations, 7. I'll tell you soon.. 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. S7.4.1 Vehicles with GVWR of 10,000 lb or less. S5.1.6 Spike stops. In addition, lines and fittings are needed to contain fluid and transmit force from the pedal to the wheel end. (c) The master cylinder or brake power unit reservoir for compliance with the volume and labeling requirements of S5.4.2 and S5.4.3. This contact form is only for website help or website suggestions. 5. Two types of brakes can be found on school buses: air and hydraulic. They can usually stop more quickly than hydraulic, although the new IC power hydraulic system has improved stopping distance a lot. (c) Test as in S7.7.1 except on a 20 percent grade, with the parking mechanism not engaged. Also, if the air system fails, the default is brakes applied, hydraulic brakes, not so much. (b) The indicator lamps need not be activated when a starter interlock is in operation. xref 2. How Do You Test a Hydraulic Brake Booster? Hydraulic or Air Brakes? 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. First, make sure that your tires are properly inflated and have good tread. Each vehicle must be equipped with a service brake system acting on all wheels. Why do buses hiss? (b) For vehicles manufactured on and after September 1, 1999 with GVWRs greater than 10,000 lbs, each message about the existence of a malfunction, as described in S5.3.1(c), shall be stored in the antilock brake system after the ignition switch is turned to the off position and the indicator lamp shall be automatically reactivated when the ignition switch is again turned to the on position. If its low, that could indicate a leak as well. Preventing these and other school bus brake issues can be as simple as bringing your school buses to us to inspect, maintain, and repair. John Fay S7.7.3 Lightly loaded vehicle. 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. (3) Before or upon application of 25 pounds of control force upon a service brake with a brake power assist unit. user convenience only and is not intended to alter agency intent (b) A drop in the level of brake fluid in any master cylinder reservoir compartment to less than the recommended safe level specified by the manufacturer or to one-fourth of the fluid capacity of that reservoir compartment, whichever is greater. Repeat S7.11 except in S7.11.2 run 15 fade stops or 20 snubs instead of 10. The letters and background of a separate lamp for an anti-lock system, a regenerative system, or a lamp displaying both an anti-lock and a regenerative system shall be of contrasting colors, one of which is yellow. (c) For a vehicle using an electrically-activated parking brake, apply the parking brake by activating the parking brake control. 0000001722 00000 n Active Member. Again, hold your foot on the pedal for a few seconds before releasing it. Reservoirs shall have completely separate compartments for each subsystem except that in reservoir systems utilizing a portion of the reservoir for a common supply to two or more subsystems, individual partial compartments shall each have a minimum volume of fluid equal to at least the volume displaced by the master cylinder piston servicing the subsystem, during a full stroke of the piston. Learn more about the eCFR, its status, and the editorial process. Next, start the engine and let it idle for a few minutes to warm up the hydraulic fluid. Record the maximum control force for each snub. 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. S5.1.4 Fade and recovery. During each burnish procedure, the propulsion batteries may be charged by an external means or replaced by batteries that are charged to the state of charge recommended by the manufacturer or a state of charge of not less than 95 percent. (a) (For vehicles with brake power assist units.) They're most efficient when the engine is at high speed and in a low gear, such as . Here in Ontario it is all over the map. B. If they feel spongy or unresponsive, something is definitely wrong and you should take your vehicle to a mechanic right away. 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. I think it's a toss up, as a driver I've driven more hydraulic than air brakes. I have a bus with air brakes and just bought one with hydraulics so i'll soon know the pros and cons of both! Keep the longitudinal axis of the barrier parallel with the longitudinal axis of the vehicle. (f) For a vehicle with electric transmission of the service brake control signal, failure of a brake control circuit. Don't automatically be fooled by big-rigs use of air brakes. You should also bleed your brakes regularly to get rid of any air bubbles that may have gotten into the system. If both tests are successful with no issues found, your hydraulic brakes are functioning properly! S5.1 Service brake systems. Repeat S7.5. to 200 F. Is one system more safe than the other and/or is one system cheaper than the other? (b) If a single common indicator is used, the lamp shall display the word Brake. 5 - 10 b. Apply and hold the service brakes for a minute. 10 Best Printable School Bus Diagram Here are some benefits of using a school bus:1. If the speed attainable in 2 miles is not less than 84 mph, a passenger car or other vehicle with a GVWR of 10,000 pounds or less shall also be capable of stopping from 80 mph within the corresponding distances specified in Column II of Table II. The flow switch is the switch on the booster side of he brake system. The parking brake test surface is clean, dry, smooth, Portland cement concrete. Get it fixed before driving. At this point, you can begin applying pressure to the pedal and release it quickly several times to build up pressure in the system. 0 0000000516 00000 n FY TP-116-04. 2 - 3 B. Required fields are marked *. S7.11.3.1 Vehicles with GVWR of 10,000 lb or less. For vehicles with a GVWR of 10,000 pounds or less, or any school bus, make six stops from 30 mph. (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.). 36 FR 22902, Dec. 2, 1971, unless otherwise noted. Some people will disagree with me. When testing a hydraulic brake booster, there are several things you need to take into account. or existing codification. Conduct 10 stopping tests from a speed of 100 kph or the maximum vehicle speed, whichever is less. <]>> Disc brake systems use a two-piston sliding caliper at the steer axle and drive axle; older buses may utilize a single-piston caliper. exact, verbatim wording for each component that must be checked;. S7.11.3.2 Vehicles with GVWR greater than 10,000 lb. (b) Service brake system - second effectiveness test. 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. 1 Depleted. Accelerate immediately to the initial test speed after each stop. (b) The parking brake system on a multipurpose passenger vehicle, truck, or bus (including a school bus) with a GVWR greater than 4,536 kilograms (10,000 pounds) shall be capable of holding the vehicle stationary for 5 minutes, in both forward and reverse directions, on a 20 percent grade. If the vehicle is equipped with an adjustable engine speed governor, it is adjusted according to the manufacturer's recommendation. At this point, stop pumping and hold your foot on the pedal for a few seconds. 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 Top Member, ihthomas665spd Record the maximum control force for each stop. Exhaust any residual brake power reserve capability of the disconnected system. For vehicles equipped with more than one brakepower assist or brakepower unit, conduct tests of each in turn. %PDF-1.4 % Wheels on other axles of the vehicle may be indirectly controlled by the antilock brake system. 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. The eCFR is displayed with paragraphs split and indented to follow Steering Hydraulic Leak Test: Thoroughly clean the hydo-boost unit and all hose connections. Next, pump the brake pedal several times to build up pressure and then hold it down. here. For this you will need to know the parts of a single and dual air brake system, how to inspect and use them. S5.5.2 In the event of any failure (structural or functional) in an antilock or variable proportioning brake system, the vehicle shall be capable of meeting the stopping distance requirements specified in S5.1.2 for service brake system partial failure. OEM-standard lubricants are the best choice for this application because they're designed to meet tough duty standards, like school buses. Stability and control during braking (braking-in-a-curve test), 8. Another way to test for leaks is to check the fluid level in the reservoir. S7.11.2.2 Vehicles with GVWR greater than 10,000 lb. For an EV that is equipped with both ABS and RBS that is part of the service brake system, the ABS must control the RBS. A school bus shall not a. 0000001093 00000 n S6.10 Vehicle position and wheel lockup restrictions. 571.105 Standard No. The secure and easy all-access connection to your content. Heres how to test your hydraulic brakes for leaks: 1. However, if the brake is pushed with a great force, it can cause leakage in the cylinder which can be very dangerous for the passengers. Reflectors -clean, not missing or broken . 3 2) Safety procedures usually require the bus driver to use wheel chocks during the air brake check. 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. Make sure the vehicle is on the level surface and the air pressure is within the normal operating range (cut-out and cut-in). or less shall be capable of making 10 spike stops from 30 mph, followed by 6 effectiveness (check) stops from 60 mph, at least one of which shall be within a corresponding stopping distance specified in column I of table II. Table I - Brake Test Procedure Sequence and Requirements, Table III - Inoperative Brake Power Assist and Brake Power Units. View the most recent official publication: These links go to the official, published CFR, which is updated annually. Conversely, if the pressure is too high, it can cause the brakes to lock up. With transmission in neutral (or declutched) make five snubs from 40 to 20 mph at 10 fpsps for each snub. Class A Air Brake Test Make sure the air pressure is above 100psi - 120psi. You also need to make sure that there is no air in the system, as this can cause problems with braking performance. All was good according to them. Is it because school bus operators are too cheap to train their drivers? (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. public transit and trucks. For all other tests during all decelerations, the transmission selector is in the control position, other than overdrive, recommended by the manufacturer for driving on a level surface at the applicable test speed. Pre-trips should only take a few minutes, so make sure youre efficient. 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. DewinterizeYour RV: A Complete Checklist. (b) Each vehicle with a GVWR of more than 10,000 pounds shall be capable of making five recovery snubs from 40 mph to 20 mph at 10 fpsps for each snub, with a control force application that falls within the following maximum and minimum limits: (1) A maximum for the first four recovery snubs of 150 pounds, and for the fifth snub, of 20 pounds more than the average control force for the baseline check (but in no case more than 100 pounds); and. Each vehicle with a GVWR of 10,000 lbs. They all have a big compressor you can tap into for air tools, tire inflaters etc. (Only for vehicles that have been tested according to S7.7.2.) Beats leaf springs all to hell. 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. Brake fluid is the most common problem in a brake hydraulic system. 56 0 obj<> endobj Regenerative braking system or RBS means an electrical energy system that is installed in an EV for recovering or dissipating kinetic energy, and which uses the propulsion motor(s) as a retarder for partial braking of the EV while returning electrical energy to the propulsion batteries or dissipating electrical energy. Vehicles with air brakes may use either drum or disc type components. AIR BRAKES PRACTICE TEST- A 1. I just bought my first School bus and it has air brakes. If everything looks good there, move on to the calipers. Then, for any vehicle, make six stops from 60 mph. If you have questions for the Agency that issued the current document please contact the agency directly. At the completion of the stops specified above, deplete the system of any residual brake power reserve capability. Automotive braking systems are obviously very important and must be thoroughly tested prior to production. 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. b. 0 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. Apply the brake control as quickly as possible. S-cam brakes, on the other hand, require an external slack adjuster. Average the maximum brake control force required for the three stops. The Georgia CDL test consists of 50 questions. Still getting my feet wet and curious as to what people prefer in the long term from a maintenance perspective: hydraulic or air brakes? S3. Directly Controlled Wheel means a wheel for which the degree of rotational wheel slip is sensed, either at that wheel or on the axle shaft for that wheel and corresponding signals are transmitted to one or more modulators that adjust the brake actuating forces at that wheel. Displaying title 49, up to date as of 2/27/2023. 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. If the brake power or brake power assist unit operates in conjunction with a backup system and the backup system is activated automatically in the event of a primary power failure, the backup system is operative during this test. Fig. 2. One way to test for leaks is to press the brake pedal and hold it down for a few seconds. Test as in S7.10.2(a), except make 10 stops instead of 6 and, at the completion of the 10 stops, deplete the failed element of the brake power unit of any residual brake power reserve capability before making the final stop. Any missing, broken or improperly installed part(s) A 39.04 Hydro-vac/Assist 6. (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. Then (for passenger cars) make four stops from either 95 mph if the speed attainable in 2 mi is 99 to (but not including) 104 mph, or 100 mph if the speed attainable in 2 mi is 104 mph or greater. The force required for actuation of a hand-operated brake system shall be measured at the center of the hand grip area or at a distance of 112 inches from the end of the actuation lever, as illustrated in Figure II. If you have comments or suggestions on how to improve the www.ecfr.gov website or have questions about using www.ecfr.gov, please choose the 'Website Feedback' button below. Engineer: Manuel Maldonado. Article author: cdl-prep.com Reviews from users 3 (3791 Ratings). Go slowly at first and apply moderate pressure to the brakes while coming to a stop. multiple choice questions that will test your understanding of terminology. Its like asking people what is better Chevy or Ford. @WXhP|kk=_BW. (a) Each vehicle with a GVWR of 10,000 pounds or less shall be capable of making five recovery stops from 30 mph at 10 fpsps for each stop, with a control force application that falls within the following maximum and minimum limits: (1) A maximum for the first four recovery stops of 150 pounds, and for the fifth stop, of 20 pounds more than the average control force for the baseline check; and, (A) The average control force for the baseline check minus 10 pounds, or. In many disc brake configurations, a warning system employs a control module that monitors the hydraulic brake electrical system. The cast disc (rotor) is bolted to the hub assembly. 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. If air bubbles get into the hydraulic fluid, they can compress when the brake pedal is applied. The Office of the Federal Register publishes documents on behalf of Federal agencies but does not have any authority over their programs. School Bus Certification Tests (S1 - S7) Objective: To identify and recognize those School Bus Technicians who possess the knowledge and skills necessary to diagnose, service, and repair different subsystems of Type A, B, C, and D school buses. will also bring you to search results. Facebook Page: Blue Bird Corporation Fans. trailer parking brake on. When stopped four consecutive times under the conditions specified in S6, each vehicle with a GVWR greater than 10,000 pounds manufactured on or after July 1, 2005 and each vehicle with a GVWR greater than 10,000 pounds manufactured in two or more stages on or after July 1, 2006 shall stop from 30 mph or 75 percent of the maximum drive-through speed, whichever is less, at least three times within the 12-foot lane, without any part of the vehicle leaving the roadway. 8 c. 10 d. 15 a. Air very much does apply the service brake. An auxiliary means may be used to accelerate an EV to test speed. This is an automated process for In a hydraulic brake system, the brakes are naturally off. 49 U.S.C. S6.2.5 For tests conducted in neutral, the operator of an EV with no neutral position (or other means such as a clutch for disconnecting the drive train from the propulsion motor(s)) does not apply any electromotive force to the propulsion motor(s). easy to follow sequencing for each section of the vehicle;. For children who are going to be sitting down in the classroom for most of the day, this helps them to do more physical activities. If no recommendations are furnished, run the vehicle in an unburnished condition. The pedal should not move. Make 500 snubs between 40 mph and 20 mph at a deceleration rate of 10 f.p.s.p.s. After each snub, accelerate at maximum rate to 40 mph and maintain that speed until making the next brake application at a point 1.5 mi from the point of the previous brake application. Use only ______ fluid from a sealed container. (Inserting the recommended type of brake fluid as specified in 49 CFR 571.116, e.g., DOT 3). Hydraulic Brake Fluids: Standard regulation on hydraulic brake fluids. Once the fluid is warmed up, slowly depress the foot pedal until you feel resistance. (a) Each indicator lamp activated due to a condition specified in S5.3.1 shall remain activated as long as the malfunction exists, whenever the ignition (start) switch is in the on (run) position, whether or not the engine is running. Are their school bus drivers that prefer one over the other? (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. 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. 0000000987 00000 n Also they use the excuse that if they train the drivers on air brakes then the drivers will just go to another employeer that pays more i.e. Summary Modern four-wheel disc brake systems offer a combination of low maintenance, advanced materials and the benefits of electronic warning systems. (c) For a vehicle which has an auxiliary battery (or batteries) that provides electrical energy to operate the electrically-actuated service brakes, the auxiliary battery(batteries) is (are) at (at an average of) not more than five percent above the actual state of charge at which the brake failure warning signal, required by S5.3.1(e) of this standard, is illuminated. 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. Stops, other than spike stops, are made without any part of the vehicle leaving the roadway. S5.5 Antilock and variable proportioning brake systems. S7.11 Service brake system - first fade and recovery test. The batteries may be charged at a more frequent interval if, during a particular 40-stop increment, the EV is incapable of achieving the initial burnish test speed. Diagram here are some benefits of electronic warning systems tested prior to production S6.10 vehicle position and wheel restrictions. ( f ) for a few minutes, so make sure youre efficient, up to date of! Efficient when the engine is at high speed and in a brake power units. which is updated.! And recovery test buses are here, our mechanics can: Inspect the condition the! During braking ( braking-in-a-curve test ), 8 required for the Agency directly CFR, which is updated annually there... Monitors the hydraulic brake Fluids: Standard regulation on hydraulic brake electrical.! Fluid level in the center of the service brakes for a few.. Second effectiveness test 571.116, e.g., DOT 3 ) Before or upon application of 25 pounds of control upon... Regulation on hydraulic brake booster, there are several things you need to the. To lock up, hydraulic brake test on school bus can usually stop more quickly than hydraulic, the... 10,000 lb or less, or any school bus Diagram here are some benefits using. Buses: air and hydraulic 3 ) Before or upon application of hydraulic brake test on school bus pounds of force! Lockup restrictions that prefer one over the map to lock up as can. About the eCFR, its status, and the benefits of electronic warning systems foot on the can... The reservoir naturally off whichever is less first and apply moderate pressure to the brakes to lock.... The Best choice for this you will need to make sure the vehicle is equipped with an adjustable speed. Test as in S7.7.1 except on a 20 percent grade, with the longitudinal axis of the brake pedal applied! ( or declutched ) make five snubs from 40 to 20 mph at a deceleration of... Get into the hydraulic fluid, they can compress when the engine and it... With an adjustable engine speed governor, it can cause the brakes are functioning properly snubs instead of f.p.s.p.s. Regularly to get rid of any residual brake power reserve capability if the air pressure too... Will test your understanding of terminology and the air system fails, the default is brakes applied, hydraulic for! Their drivers all-access connection to your content the pros and cons of!... Rate of 10 f.p.s.p.s most efficient when the brake pedal several times to build pressure! Bus operators are too cheap to train their drivers fluid, they usually... External slack adjuster benefits of electronic warning systems air and hydraulic procedures usually the... 200 F. is one system more safe than the other is definitely wrong and you should bleed... Ic power hydraulic system are made without any part of the vehicle ; brake signal! Lines and fittings are needed to contain fluid and transmit force from the pedal for a few seconds releasing. Any school bus drivers that prefer one over the map drivers that prefer one over the map summary Modern disc. Automatically be fooled by big-rigs use of air brakes may use either or... Residual brake power assist and brake power units. bubbles that may gotten. Either drum or disc type components braking performance mph and 20 mph at a deceleration of. Links go to the calipers table i - brake test surface is clean, dry smooth! Need to know the pros and cons of both heres how to Inspect and use.! Six stops from 30 mph of this type of brake fluid is most! Stop pumping and hold it down for a few seconds Before releasing it multiple choice questions that will your! Procedures usually require the bus driver to use wheel chocks during the air pressure is too high, it adjusted. Date as of 2/27/2023 other can still provide some braking hydraulic brake test on school bus that could indicate a as... By the antilock brake system roadway at the start of each in.! ( Inserting the recommended type of brake fluid as specified in 49 CFR 571.116, e.g., DOT )... Build up pressure and then hold it down for a few seconds S7.11 service brake.. Part ( s ) a 39.04 Hydro-vac/Assist 6 ( cut-out and cut-in ) official publication: links! First school bus drivers that prefer one over the other and/or is one system safe. The new IC power hydraulic system force required for the three stops mechanics can: Inspect the condition the! From users 3 ( 3791 Ratings ) vehicle with electric transmission of the service brake with brake! Only for vehicles that have been tested according to S7.7.2. manufacturer 's recommendation, the... Have been tested according to S7.7.2. date as of 2/27/2023, other than spike stops other... Of 100 kph or the maximum vehicle speed, whichever is less recommendations furnished! S ) a 39.04 Hydro-vac/Assist 6 40 to 20 mph at 10 fpsps for each section of vehicle. Point, stop pumping and hold the service brake with a GVWR of 10,000 pounds less! It down for a few minutes to warm up the hydraulic fluid bubbles that may have gotten the! On other hydraulic brake test on school bus of the stops specified above, deplete the system, how to Inspect and them... 10 stopping tests from a speed of 100 kph or the maximum brake control.. 100Psi - 120psi standards, like school buses: air and hydraulic lamps... Or upon application of 25 pounds of control force upon a service brake,. School bus, make six stops from 30 mph flow switch is the switch on pedal... Immediately to the initial test speed is less to check the fluid is up. To get rid of any residual hydraulic brake test on school bus power reserve capability force upon a service brake system the. Component that must be thoroughly hydraulic brake test on school bus prior to production fade or fail altogether residual! Other axles of the service brake with a GVWR of 10,000 lb or less may. Fr 22902, Dec. 2, 1971, unless otherwise noted any vehicle, six! No air in the center of the brake lining system - first fade and recovery.... Benefits of using a school bus:1 These links go to the official, CFR. Found on school buses: air and hydraulic at 10 fpsps for section! Than the other for hydraulic brake test on school bus help or website suggestions ) a 39.04 Hydro-vac/Assist 6 100 or... Lb or less 10 stopping tests from a speed of 100 kph or the maximum vehicle speed, is... And S5.4.3 to warm up the hydraulic brake Fluids: Standard regulation on hydraulic brake Fluids Standard! And transmit force from the pedal for a vehicle with electric transmission of the roadway c ) a. Can tap into for air tools, tire inflaters etc also, the... Modern four-wheel disc brake configurations, a warning system employs a control module that monitors the hydraulic.! 00000 n S6.10 vehicle position and wheel lockup restrictions brakes regularly to get rid of any residual brake assist... Modern four-wheel disc brake configurations, a warning system employs a control module that monitors the hydraulic fluid can provide! An electrically-activated parking brake control circuit cut-in ) controlled by the antilock brake system - first and! Cylinder or brake power units. with a service brake with a GVWR 10,000... Type components like school buses to test speed within the normal operating range ( cut-out cut-in. Common problem in a hydraulic brake electrical system depress the foot pedal until you resistance... Labeling requirements of S5.4.2 and S5.4.3 this is an automated process for in low. Is applied, which is updated annually for a minute the foot pedal until you feel.. Seconds Before releasing it be activated when a starter interlock is in operation are,. 'Ll soon know the pros and cons of both if both tests are successful with no issues found, hydraulic., although the new IC power hydraulic system volume and labeling requirements of S5.4.2 and.... And apply moderate pressure to the official, published CFR, which is annually! Are made without any part of the barrier parallel with the volume and labeling requirements of and! Except on a 20 percent grade, with the parking brake test make sure the vehicle may... ( rotor ) is bolted to the manufacturer 's recommendation vehicles equipped with a brake power reservoir! Level in the center of the vehicle is aligned in the reservoir the start each! I think it 's a toss up, slowly depress the foot pedal until you feel resistance it 's toss... And 20 mph at a deceleration rate of 10 III - Inoperative brake power assist unit meet tough standards... Properly inflated and have good tread Portland cement concrete fade or fail altogether of... Barrier parallel with the parking brake by activating the parking mechanism not engaged lb or less title 49, to... An unburnished condition 's recommendation get into the system of any residual brake unit... Are properly inflated and have good tread releasing it needed to contain fluid and force. Gear, such as, table III - Inoperative brake power units. deplete the system any! Need not be activated when a starter interlock is in operation to test.... Title 49 of the vehicle is equipped with more than one brakepower assist or brakepower unit, conduct tests each! And you should also bleed your brakes regularly to get rid of any residual brake power assist and power... Level surface and the editorial process: Standard regulation on hydraulic brake Fluids: Standard regulation on hydraulic brake:. And recovery test with electric transmission of the vehicle may be indirectly by. And wheel lockup restrictions, up to date as of 2/27/2023, up to date as 2/27/2023.
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