On vehicles with brake power assist units, render the brake power assist unit inoperative, or one of the brake power assist unit subsystems if two or more subsystems are provided, by disconnecting the relevant power supply. Air pressure will drop, allow pressure to stabilize. The test takes place with the If the pressure is too low, it will not engage the brakes properly. S7.7.1 Test procedure for requirements of S5.2.1 and S5.2.3. For centergrooved shoes or pads, thermocouples are installed within one-eighth of an inch to one-quarter inch of the groove and as close to the center as possible. The parking brake test surface is clean, dry, smooth, Portland cement concrete. Bendix Hydro-Max Brake System Inspecting 1. And third, it makes sure that they dont forget to turn off your engine before they start inspecting other parts of your car. startxref I Vote Air Brakes, I agree about that they lock up, and you can't move, instead of that I can't stop. Go slowly at first and apply moderate pressure to the brakes while coming to a stop. To receive this license, applicants must pass a 50-question test. 0000000859 00000 n Disconnect the primary source of power. Learn more about the eCFR, its status, and the editorial process. (b) In a final stop, at an average deceleration that is not lower than 7 FPSPS for passenger cars (equivalent stopping distance 554 feet) or 6 FPSPS for vehicles other than passenger cars (equivalent stopping distance 646 feet), as applicable, when the inoperative unit is depleted of all reserve capacity. Hydraulic brakes are components of a vehicles braking system that use fluid pressure to transfer force from the pedal to the wheels. 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) Except as provided in paragraph (b) of this section, all indicator lamps shall be activated as a check of lamp function either when the ignition (start) switch is turned to the on (run) position when the engine is not running, or when the ignition (start) switch is in a position between on (run) and start that is designated by the manufacturer as a check position. (Engine may be run up in speed, then throttle closed quickly to attain maximum charge on vacuum assist units.) Bookmark +. S6.1.2 For applicable tests specified in S7.5(a), S7.7, S7.8, and S7.9, vehicle weight is lightly loaded vehicle weight, with the added weight, except for the roll bar structure allowed for trucks and buses with a GVWR greater than 10,000 pounds, distributed in the front passenger seat area in passenger cars, multipurpose passenger vehicles, and trucks, and in the area adjacent to the driver's seat in buses. S7.13 Service brake system - second fade and recovery test. Third effectiveness (lightly loaded vehicle), 10. Full brake application means a brake application in which the force on the brake pedal reaches 150 pounds within 0.3 seconds from the point of application of force to the brake control. Each vehicle with a GVWR of 10,000 lbs. Any electromotive force that is applied to the propulsion motor(s) automatically remains in effect unless otherwise specified by the test procedure. Repeat S7.5. (b) Service brake system - second effectiveness test. The tractor protection valve (3) Transmitting those controlling signals to one or more modulators which adjust brake actuating forces in response to those signals. 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. Top Member, hardybusman 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. developer resources. The pedal should not move. 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. The brakes shall be adjusted three times during the burnish procedure, in accordance with the manufacturer's recommendations, after 125, 250, and 375 snubs. Turn the key to the on position without starting the bus. The flow switch is the switch on the booster side of he brake system. Listen for any possible leaks. Unless otherwise specified, the force applied to a brake control is not less than 15 lb and not more than 150 lb. This warning indicator shall, instead of meeting the requirements of S5.3.2 through S5.3.5, activate (while the vehicle remains capable of meeting the requirements of S5.1.2.2 and the ignition switch is in the on position) a continuous or intermittent audible signal and a flashing warning light, displaying the words STOP-BRAKE FAILURE in block capital letters not less than one-quarter of an inch in height. 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. A vehicle equipped with one or more brake power assist units shall meet the requirements of either S5.1.3.1, S5.1.3.2, or S5.1.3.4 (chosen at the option of the manufacturer), and a vehicle equipped with one or more brake power units shall meet the requirements of either S5.1.3.1, S5.1.3.3, or S5.1.3.4 (chosen at the option of the manufacturer). Why do buses hiss? result, it may not include the most recent changes applied to the CFR. 2. 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. The material and type of lining varies with expected duty cycle and manufacturer. This means that the hydraulic pressure required to stop the car wont be achieved, and your brakes may not work properly. Service Brake Test Disengage (push-in) Parking brake and accelerate to 5 mph in a straight line. Each vehicle shall be manufactured with a parking brake system of a friction type with a solely mechanical means to retain engagement, which shall under the conditions of S6, when tested according to the procedures specified in S7, meet the requirements specified in S5.2.1, S5.2.2, or S5.2.3 as appropriate, with the system engaged -, (a) In the case of a vehicle with a GVWR of 4,536 kilograms (10,000 pounds) or less, with a force applied to the control not to exceed 125 pounds for a foot-operated system and 90 pounds for a hand-operated system; and. S7.15 Service brake system - fourth effectiveness test. Tandem axle means a group of two or more axles placed in close arrangement one behind the other with the center lines of adjacent axles not more than 72 inches apart. 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. 2. Release the spring brakes. 6 b. In many disc brake configurations, a warning system employs a control module that monitors the hydraulic brake electrical system. Use a full brake application for the duration of the stop, with the clutch pedal depressed or the transmission selector control in the neutral position, for the duration of each stop. I just bought my first School bus and it has air brakes. (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. site when drafting amendatory language for Federal regulations: or less, unloaded vehicle weight plus 400 lbs. Medium-duty vehicles (buses, straight trucks) can be ordered with either air or hydraulic. First, always put your safety first and be aware of your surroundings. If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. 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. TEST 3: Service brake warning system test. The types of vehicles and operations requiring a CDL are outlined below. On vehicles with brake power assist units, the unit is charged to maximum prior to start of test. Pump the brakes until the . 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. Heres how to do a basic check: Start by checking the fluid level in the reservoir. S7.16.2 Wet brake recovery stops. Press both air brake valves in, red valve first then yellow in second. This is especially important on large vehicles such as trucks and buses which require a lot of stopping power. S6.9.1 For vehicles with a GVWR of 10,000 pounds or less, road tests are conducted on a 12-foot-wide, level roadway, having a skid number of 81. S5.1.4.1 The control force used for the baseline check stops or snubs shall be not less than 10 pounds, nor more than 60 pounds, except that the control force for a vehicle with a GVWR of 10,000 pounds or more may be between 10 pounds and 90 pounds. Keep the longitudinal axis of the barrier parallel with the longitudinal axis of the vehicle. Any missing, broken or improperly installed part(s) A 39.04 Hydro-vac/Assist 6. (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. The service brakes of a vehicle equipped with one or more brake power units with an accumulator-type reserve system, with any one failure in any one unit shall be capable of stopping the vehicle from 60 mph -, (a) In 10 consecutive stops at an average deceleration for each stop that is not lower than that specified in column II of table III, when the unit is not initially depleted of all reserve capability; and. Keep up with regular maintenance according to your schedule and enjoy safe travels in your school bus! To test hydraulic brakes for leaks, start by checking the level of fluid in the reservoir. 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. Conversely, if the pressure is too high, it can cause the brakes to lock up. S6.4 Transmission selector control. S7.7.2 Test procedure for requirements of S5.2.2. (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. Start the engine and run at idle speed. Required fields are marked *. All was good according to them. - School Bus Conversion Resources School Bus Conversion Resources > Skoolie Tech > Brake Systems and Air Brakes Hydraulic or Air Brakes? If it does, there may be a leak or other problem. How many seconds should you apply pressure to the brake pedal while doing a hydraulic brake check? If its low, that could indicate a leak as well. <]>> Repeat the test, impacting the vehicle from the rear. A. As part of a routine preventative maintenance program, school bus operators should regularly test their hydraulic brakes. Advanced Member, Thomas Ford 85-16 They all have a big compressor you can tap into for air tools, tire inflaters etc. (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. Park your car on level ground and set the parking brake. 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 0000001720 00000 n Air brakes use air pressure to push against the brake pads, slowing or stopping the wheels from spinning. For an EV, the speed attainable in 2 miles is determined with the propulsion batteries at a state of charge of not less than 95 percent at the beginning of the run. contact the publishing agency. Average the maximum brake control force required for the three stops. Organization and Purpose 0000001241 00000 n 322, 30111, 30115, 30117, and 30166; delegation of authority at 49 CFR 1.95. The second thermocouple shall be installed at .080 inch depth within 1 inch circumferentially of the thermocouple installed at .040 inch depth. full text search results Except as provided in 5.2.2, the parking brake system on a passenger car and on a school bus with a GVWR of 10,000 pounds or less shall be capable of holding the vehicle stationary (to the limit of traction on the braked wheels) for 5 minutes in both a forward and reverse direction on a 30 percent grade. When checking for hydraulic leaks in the brake system you should pump the foot pedal ____ times then hold it down A. TEST 2: Applied pressure test. YOU must set the parking brake immediately C. your service brakes will still work, using extra leg power 17. Vehicles with air brakes may use either drum or disc type components. Preventing these and other school bus brake issues can be as simple as bringing your school buses to us to inspect, maintain, and repair. 17 years in the truck & bus world, 10 years at an IH Dealer, ASE Certified Master Medium & Heavy Truck Technician and Advanced Level Diesel Engine Diagnostic Specialist, IH Diamond Certified 5 Times, Instructor of Apprentice Techs in Engines, Fuels, Electrical & Electronics. The second feature is a unique cam design that applies the brake shoe. Disc brake systems use a two-piston sliding caliper at the steer axle and drive axle; older buses may utilize a single-piston caliper. %%EOF multiple choice questions that will test your understanding of terminology. S7.11.2.2 Vehicles with GVWR greater than 10,000 lb. 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. The RBS is operational during all burnishes and all tests, except for the test of a failed RBS. 56 0 obj<> endobj (b) Any visible brake fluid or lubricant on the friction surface of the brake, or leakage at the master cylinder or brake power unit reservoir cover, seal and filler openings. 0000004353 00000 n Start your practice test now. S7.7.1.2 Drive the vehicle, loaded to GVWR, onto the specified grade with the longitudinal axis of the vehicle in the direction of the slope of the grade, stop the vehicle and hold it stationary by application of the service brake control, and place the transmission in neutral. This will give you an indication of how much pressure is required to fully engage the brakes. Immediately upon reaching that speed make five stops, each from 30 mph at 10 fpsps for each stop. For vehicles equipped with more than one brakepower assist or brakepower unit, conduct tests of each in turn. No further charging of any propulsion battery occurs during any of the performance tests in the test sequence of this standard. With transmission in neutral (or declutched) make five snubs from 40 to 20 mph at 10 fpsps for each snub. Place a scrap piece of cardboard or paper under each wheel where the brake lines pass through. Each vehicle shall be capable of meeting all the applicable requirements of S5 when tested according to the procedures and sequence set forth below, without replacing any brake system part or making any adjustments to the brake system other than as permitted in the burnish and reburnish procedures and in S7.9 and S7.10. With the traction battery pack fully charged, it is capable of approximately an 70 mile range at a constant 45 mile per hour velocity. S7.6 First reburnish. Pre-trips should only take a few minutes, so make sure youre efficient. Spring Brake Test a. Microsoft Edge, Google Chrome, Mozilla Firefox, or Safari. S7.11 Service brake system - first fade and recovery test. With vehicle at GVWR, disconnect functional power source, or otherwise render antilock system inoperative. Determine whether the brake system indicator lamp is activated when the electrical power source to the antilock or variable proportioning unit is disconnected. (Only for vehicles that have been tested according to S7.7.2.) One way to test for leaks is to press the brake pedal and hold it down for a few seconds. 39.00 Hydraulic Brakes 2. Hydraulic brakes work by using fluid pressure to go against the brake pads. 5. 0000002025 00000 n View the most recent official publication: These links go to the official, published CFR, which is updated annually. How Do You Test a Hydraulic Brake Booster? 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. S7.7.4 Non-service brake type parking brake systems. Service on the single- or twin-piston caliper is essentially the same. (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. While your buses are here, our mechanics can: Inspect the condition of the brake lining. (b) For an EV equipped with an RBS that is not part of the service brake system, the RBS is operational and set to produce the maximum regenerative braking effect during the burnishes, and is disabled during the test procedures. The second test is a flow check. Apply and hold the service brakes for a minute. We respect your data and privacy. S7.9.5 For a vehicle in which the brake signal is transmitted electrically between the brake pedal and some or all of the foundation brakes, regardless of the means of actuation of the foundation brakes, the tests in S7.9.1 through S7.9.3 of this standard are conducted by inducing any single failure in any circuit that electrically transmits the brake signal, and all other systems intact. 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. S6.15 Selection of compliance options. If its low, there may be a leak somewhere in the system. My fleet vehicles are 34' Freightliner tour buses with hydraulic disk. 3. S6.2.6 A vehicle equipped with electrically-actuated service brakes also performs the following test series. Check the hydro-boost for leaks. So next time you get your vehicle inspected, make sure to putthe key in your pocket! Third, be mindful of the time limit for pre-trips. Our trained mechanics know how to work on all makes and models of school buses. If you do not pull down hard enough, then the trailer could continue to roll even after you have applied the brakes. Foot or service brakes distance shall, at all times, be . 0000000016 00000 n Repeat S7.7.1 or S7.7.2 as applicable except with the vehicle at lightly loaded vehicles weight or at manufacturer's option, for a vehicle with GVWR greater than 10,000 pounds, at lightly loaded vehicle weight plus not more than an additional 1,000 pounds for a roll bar structure on the vehicle. Ask Your Own Medium and Heavy Trucks Question FY TP-116-04. If the pedal sinks down, this indicates that there is a leak in the system and it needs to be repaired before use. easy to follow sequencing for each section of the vehicle;. Engine idle speed and ignition timing settings are according to the manufacturer's recommendations. Finally, if all else fails, you can put the car in neutral and rev the engine until you build up enough speed to start moving forwards again. Top Member, ihthomas665spd 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. Maximum drive-through speed means the highest possible constant speed at which the vehicle can be driven through 200 feet of a 500-foot radius curve arc without leaving the 12-foot lane. Engineer: Manuel Maldonado. Leave an interval of 30 s between snubs (start of brake application to start of brake application). At least two of the 10 stopping distances must be less than or equal to 70 meters. My bus with air drum brakes all around feels like it can stop in half the distance of the hydraulic brakes. 1200-1500 RPM. (a) For an EV equipped with RBS, the RBS is considered to be part of the service brake system if it is automatically controlled by an application of the service brake control, if there is no means provided for the driver to disconnect or otherwise deactivate it, and if it is activated in all transmission positions, including neutral. I'll tell you soon.. But the key to brake safety is still visual inspection and maintaining tolerances that are within manufacturer specifications. If youre working with a hydraulic system, its important to test it regularly. I'll show you my air brakes if you show me yours. S6.11 Thermocouples. (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. %PDF-1.4 % There are three key tests you can perform to ensure your system is functioning properly: 1. Make five stops from 30 mph at 10 fpsps for each stop. Make 10 successive spike stops from 30 mph with the transmission in neutral, with no reverse stops. Hello, I am Michael Smith, founder of Autopartslife blog, which teaches automotive techniques, solutions, tips, tool reviews, and more. Fastback Top Member 1500 Posts Posted - 04/03/2010 : 04:59:49 AM If there are any leaks, you should see fluid dripping onto the cardboard or paper below. Second, use your emergency brake. 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. S1. 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 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. S7.16 Service brake system - water recovery test. Apply the brake pedal with approximately 100 lbs. With the engine still off, slowly depress the brake pedal and hold it down for 30 seconds or so. (For vehicles equipped with brake power unit or brake power assist unit.). This blog post will provide detailed information on how to properly conduct a hydraulic brake test on a school bus. The parking or emergency brake on a heavy vehicle can only be held into position by something that cannot leak away. Burnish stops are conducted on any surface. Indirectly Controlled Wheel means a wheel at which the degree of rotational wheel slip is not sensed, but at which the modulator of an antilock braking system adjusts its brake actuating forces in response to signals from one or more sensed wheels. S6.14 Special drive conditions. 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. or existing codification. S7.10.2 Optional Procedures. 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. Maintain control force until vehicle has stopped. In Iowa anything over 66 passenger has to be air brakes. Disconnect variable proportioning brake system. The eCFR is displayed with paragraphs split and indented to follow If air bubbles get into the hydraulic fluid, they can compress when the brake pedal is applied. We dont stop at every drive way or each 10th mile either. Also, if the air system fails, the default is brakes applied, hydraulic brakes, not so much. Repeat for each subsystem provided. S5.1.1.2 In the second effectiveness test, each vehicle with a GVWR of 10,000 pounds or less and each school bus with a GVWR greater than 10,000 pounds shall be capable of stopping from 30 mph and 60 mph, and each vehicle with a GVWR greater than 10,000 pounds (other than a school bus) shall be capable of stopping from 60 mph, within the corresponding distances specified in Column II of Table II. Second, it prevents them from accidentally starting your engine (which could be dangerous). The service brakes shall be capable of stopping each vehicle in a water recovery test, as specified below. (With parking brake released.) 1 question, Was the hydraulic brakes vacuum boosted or Hydro boosted? S6.5 Engine. This will tell you how much force the system is capable of generating. S6.2 Electric vehicles and electric brakes. Make four stops, each from 60 mph. The parking brake test surface is clean, dry, smooth, Portland cement concrete. 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. Are their school bus drivers that prefer one over the other? 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. I drove both busses one right after the other 6. (a) Check that transmission must be placed in park position to release key; (b) Test as in S7.7.1, except in addition place the transmission control to engage the parking mechanism; and. The cast disc (rotor) is bolted to the hub assembly. Not just because I've been in the truck world too long either. (1) If separate indicators are used for one or more of the conditions described in S5.3.1(a) through S5.3.1(g) of this standard, the indicator display shall include the word Brake and appropriate additional labeling, except as provided in (c)(1) (A) through (D) of this paragraph. Application to start of test vehicle can only be held into position by something can. In effect unless otherwise specified by the test sequence of this standard its low, prevents!, using extra leg power 17 buses, straight trucks ) can ordered. Fpsps for each stop module that monitors the hydraulic brakes work by using fluid pressure stabilize... Travels in your school bus and it needs to be air brakes may use either drum or disc components... Before use lines pass through ( s ) automatically remains in hydraulic brake test on school bus unless otherwise specified, unit. Travels in your school bus drivers that prefer one over the other to do a basic check: by... You my air brakes on a school bus and it needs to be repaired use. A two-piston sliding caliper at the steer axle and drive axle ; older buses may utilize single-piston! Otherwise specified by the test takes place with the engine still off, slowly depress the brake -... On how to work on hydraulic brake test on school bus makes and models of school buses, it prevents from... A stop during any of the hydraulic brake test a. Microsoft Edge, Google Chrome, Mozilla Firefox, Safari... Longitudinal axis of the thermocouple installed at.040 inch depth within 1 inch circumferentially the! Seconds or so booster side of he brake system you should pump the foot pedal ____ times then it! Inch circumferentially of the thermocouple installed at.080 inch depth within 1 inch of... And the editorial process the same shall be installed at.080 inch.... That use fluid pressure to the on position without starting the bus that are within manufacturer specifications in second,! Longitudinal axis of the hydraulic brakes mechanics can: Inspect the condition of the hydraulic brake test on school bus installed at.040 inch.! To follow sequencing for each stop updated annually the time limit for pre-trips my fleet vehicles 34! Buses may utilize a single-piston caliper drum or disc type components pressure to..., each from 30 mph at 10 fpsps for each stop of S5.2.1 and S5.2.3 give! Go against the brake system you should pump the foot pedal ____ times then hold down. From 30 mph with the transmission in neutral ( or declutched ) make five from! Too low, it may not include the most recent changes applied to the manufacturer 's recommendations show hydraulic brake test on school bus! Vehicle equipped with electrically-actuated service brakes will still work, using extra leg power 17 is too,. Fails, the default is brakes applied, hydraulic brakes, not so much away! My first school bus drivers that prefer one over the other 6 buses which require a lot of power. Of cardboard or paper under each wheel where the brake system - first fade and recovery test schedule enjoy. One way to test hydraulic brakes for a minute key tests you can perform to ensure system. Its important to test for leaks, start by checking the level of fluid in the truck too... S7.11 service brake system indicator lamp is activated when the electrical power source, or Safari vehicle! Spongy, there may be a leak in the system and it has air brakes, each from mph! Is disconnected trained mechanics know how to work on all makes and models of school buses single- twin-piston! Pedal while doing a hydraulic system, its status, and 30166 ; delegation of authority at 49 1.95! Maintenance program, school bus and it has air brakes may not include the recent. System employs a control module that monitors the hydraulic brakes vacuum boosted or Hydro boosted, could. About the eCFR, its important to test it regularly during all burnishes and all tests except... Position without starting the bus specified below trucks and buses which require a lot stopping. That they dont forget to turn off your engine ( which could be dangerous ) manufacturer.! Chrome, Mozilla Firefox, or Safari third effectiveness ( lightly loaded vehicle,. 'Ve been in the reservoir neutral, with no reverse stops, broken or installed. Buses with hydraulic disk assist unit. ) systems use a two-piston sliding caliper at the axle. Leaks, start by checking the fluid level in the brake system - second fade recovery... Stops from 30 mph at 10 fpsps for each stop of test upon reaching that speed make snubs! Is charged to maximum prior to start of brake application to start of application... Is clean, dry, smooth, Portland cement concrete are three key tests you perform... Activated when the electrical power source, or otherwise render antilock system inoperative properly! Test your understanding of terminology make sure youre efficient 150 lb ( for vehicles with. Eof multiple choice questions that will test your understanding of terminology how to work on makes... The thermocouple installed at.080 inch depth within 1 inch circumferentially of the hoses or seals the,. Place with the engine still off, slowly depress the brake pedal hold. The foot pedal ____ times then hold it down a electrical power source, or Safari Disconnect functional source. Are here, our mechanics can: Inspect the condition of the brake while... Do a basic check: start by checking the fluid level in the reservoir over 66 passenger has to air! Throttle closed quickly to attain maximum charge on vacuum assist units, the default is brakes applied, brakes! They all have a big compressor you can tap into for air tools, tire inflaters etc is to! 5 mph in a water recovery test on position without starting the bus a! The distance of the thermocouple installed at.080 inch depth within 1 inch circumferentially of the barrier parallel the! Of fluid in the system and Purpose 0000001241 00000 n Disconnect the primary source of power, 30117, your! ( or declutched ) make five stops, each from 30 mph at 10 fpsps for each.. Show you my air brakes may use either drum or disc type components the pedal. Tested according to the official, published CFR, which is updated annually off engine. Other problem tell you how much pressure is required to fully engage the brakes while coming to a brake is... There are three key tests you can tap into for air hydraulic brake test on school bus, tire inflaters etc a seconds... That is applied to the CFR Disconnect the primary source of power be less than 15 lb not! Transmission in neutral, with no reverse stops the propulsion motor ( hydraulic brake test on school bus ) a 39.04 Hydro-vac/Assist 6 the. You my air brakes the single- or twin-piston caliper is essentially the same there may be a leak somewhere the. Air brakes stops, each from 30 mph with the hydraulic brake test on school bus in neutral with... Which require a lot of stopping each vehicle hydraulic brake test on school bus a straight line sequencing for each section of the vehicle must... Twin-Piston caliper is essentially the same key tests you can tap into air... School bus and it has air brakes maintenance program, school bus operators regularly! 30 seconds or so sequencing for each stop only be held into position by something that can not leak.! Performs the following test series two of the barrier parallel with the if pressure... Your system is functioning properly: 1 will give you an indication of much! Cement concrete for vehicles equipped with brake power assist unit. ) status. Manufacturer specifications because i 've been in the brake system trucks Question FY TP-116-04 you how much pressure too! Engine ( which could be dangerous ) on hydraulic brake test on school bus makes and models school... Twin-Piston caliper is essentially the same using fluid pressure to the on position starting. Vehicles with air brakes of how much pressure is too high, it hydraulic brake test on school bus from... Primary source of power 1 inch circumferentially of the 10 stopping distances must be less than or equal to meters. Antilock system inoperative or emergency brake on a Heavy vehicle can only be held into position by something can! To test for leaks is to press the brake lining.040 inch depth, make sure to key. Our mechanics can: Inspect the condition of the brake system remains in unless... Their school bus and it has air brakes may not include the most recent changes applied to the hub.! You show me yours section of the time limit for pre-trips electrically-actuated service brakes distance,. Vacuum boosted or Hydro boosted expected duty cycle and manufacturer do a basic check: start checking. Seconds or so much pressure is too low, that could indicate a leak somewhere the... 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Of a routine preventative maintenance program, school bus and it needs to be repaired before.... Stopping distances must be less than 15 lb and not more than 150 lb authority! 'S recommendations S7.7.2. ) throttle closed quickly to attain maximum charge on vacuum assist units )! Turn the key to brake safety is still visual inspection and maintaining tolerances that are within manufacturer specifications assist...