2 - 3 B. S5.1.6 Spike stops. Step on Service (foot) brake pedal to stop bus. To avoid engine stall during tests required to be run in gear a manual transmission may be shifted to neutral (or the clutch disengaged) when the vehicle speed decreases to 20 mph. a. This content is from the eCFR and is authoritative but unofficial. (a) (For vehicles with brake power assist units.) endstream
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(b) After being driven for 2 minutes at a speed of 5 mph in any combination of forward and reverse directions through a trough having a water depth of 6 inches, each vehicle with a GVWR of more than 10,000 pounds 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 60 pounds more than the average control force for the baseline check (but in no case more than 110 pounds); and. Use the navigation links in the gray bar above to view the table of contents that this content belongs to. The eCFR is displayed with paragraphs split and indented to follow Start your practice test now. Why do buses hiss? Effectively, the engine works backwards by creating negative torque. S5.4.1 Master cylinder reservoirs. 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. 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. During each burnish procedure, each propulsion battery is restored to the recommended state of charge or a state of charge of not less than 95 percent after each increment of 40 burnish stops until each burnish procedure is complete. The process to get a CDL with the necessary passenger, school bus and air brake endorsements isn't an easy task and can take up to 60 days, said Chloe Williams, New Jersey School Bus Contractors . 39. Please do not provide confidential 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. Make four stops, each from 60 mph by a continuous application of the service brake control. When youre getting your vehicle inspected, one of the things the inspector will do is test the starter switch. (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. Microsoft Edge, Google Chrome, Mozilla Firefox, or Safari. Facebook Page: Blue Bird Corporation Fans. 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. The parking or emergency brake on a heavy vehicle can only be held into position by something that cannot leak away. (E) If a separate indicator is used for the regenerative brake system, the symbol RBS may be used. 0000000016 00000 n
If its low, top it off and bleed the brakes according to the manufacturers instructions. (e) For a vehicle with electrically-actuated service brakes, failure of the source of electric power to the brakes, or diminution of state of charge of the batteries to less than a level specified by the manufacturer for the purpose of warning a driver of degraded brake performance. Each vehicle must be equipped with a service brake system acting on all wheels. 16. (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. This is especially important on large vehicles such as trucks and buses which require a lot of stopping power. Step on the brake and hold the pedal down for one minute. Test procedure and sequence. Each truck and bus (other than a school bus) with a GVWR of 4,536 kg (10,000 pounds) or less which is subject to this part and school buses with a GVWR greater than 4,536 kg (10,000 pounds) shall be equipped with a parking brake system as required by FMVSS No. If the pedal sinks down, this indicates that there is a leak in the system and it needs to be repaired before use. If everything looks good so far, engage your parking brake and repeat steps 2-4 with your foot off ofthe pedal entirely (this tests your emergency brake). 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. Make four stops if the vehicle is equipped with a split service brake system, or 10 stops if the vehicle is not so equipped, each from 60 mph, by a continuous application of the service brake control. Maintain control force until vehicle has stopped. Bookmarked content can then be accessed anytime on all of your logged in devices! 0000000987 00000 n
This free CDL practice test will focus on 30 questions related to the Air Brake portion of the Texas CDL exam. Determine whether the brake system indicator lamp is activated when the RBS is disconnected. Oh yeah hydraulics are also nice because not all of my drivers are licensed for air brakes. S7.11.2.1 Vehicles with GVWR of 10,000 pounds or less. S7.16.1 Baseline check stop. Air Brakes - They just plain Sound Bad-Ass!! S7.11 Service brake system - first fade and recovery test. Still getting my feet wet and curious as to what people prefer in the long term from a maintenance perspective: hydraulic or air brakes? Repeat the test, impacting the vehicle from the rear. S6.6 Vehicle openings. HWn}W#Xwy76 (Ipj.Z. 1 CFR 1.1 0000001241 00000 n
39.00 Hydraulic Brakes 2. We dont stop at every drive way or each 10th mile either. 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. Second, it prevents them from accidentally starting your engine (which could be dangerous). Make 500 snubs between 40 mph and 20 mph at a deceleration rate of 10 f.p.s.p.s. 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. Inoperative brake power and power assist units. Conventional School Bus (with Hydraulic Brakes) PreTrip & Procedures K Schriel 40 subscribers Share 1.4K views 8 months ago Included at the end is a Railroad Crossing Procedure, Student. In Iowa anything over 66 passenger has to be air brakes. If the speed attainable in 2 miles is not less than 99 mph, a passenger car shall, in addition, be capable of stopping from the applicable speed indicated below, within the corresponding distance specified in column I of table II. 5. 41. (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. Bus should stop in straight line without pulling to one side or the other. (3) Before or upon application of 25 pounds of control force upon a service brake with a brake power assist unit. Loss of fluid from one compartment shall not result in a complete loss of brake fluid from another compartment. The choice of this option must not be construed as adding to the requirements specified in S5.1.2 and S5.1.3.) With a moving barrier as described in paragraph 4.3 of SAE Recommended Practice J972 (2000) (incorporated by reference, see 571.5), impact the vehicle from the front at 212 mph. Place bus in Neutral and set parking brake. 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. (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. Listen for any possible leaks. If a vehicle is incapable of attaining a speed specified in S5.1.4 in the time or distance interval set forth, it must be tested at the highest speed attainable in the time or distance interval specified. School Bus Test: Standard regulation on school bus pedestrian safety devices - school bus test. If the vehicle cannot attain a speed of 40 mph in 1 mph, continue to accelerate until the vehicle reaches 40 mph or until the vehicle has traveled 1.5 miles from the initial point of the previous brake application, whichever occurs first. 1 question, Was the hydraulic brakes vacuum boosted or Hydro boosted? 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. Nomenclature changes to part 571 appear at 69 FR 18803, Apr. 8 c. 10 d. 15 August 1, 1997
(This test need not be run if the option in S7.10.2 is selected.) S7.6 First reburnish. 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. The CDL General Knowledge practice test covers topics such as the rules of having a CDL and driving a commercial vehicle safety. (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. This content is from the eCFR and may include recent changes applied to the CFR. Compliance of vehicles manufactured in two or more stages may, at the option of the final-stage manufacturer, be demonstrated to comply with this standard by adherence to the instructions of the incomplete manufacturer provided with the vehicle in accordance with 568.4(a)(7)(ii) and 568.5 of title 49 of the Code of Federal Regulations. startxref
After leaving the trough, immediately accelerate at a maximum rate to 30 mph without a brake application. (a) For vehicles with a GVWR of 10,000 lbs. 3. For vehicles equipped with more than one brakepower assist or brakepower unit, conduct tests of each in turn. I couldnt tell exactly on my rears but thought it almost looked drum.. but I guess in 2000 it was not dont that way anymore so I probably have disc on that hydro bus. (a) The service brakes shall be capable of stopping each vehicle with a GVWR of less than 8,000 pounds, and each school bus with a GVWR between 8,000 pounds and 10,000 pounds in four effectiveness tests within the distances and from the speeds specified in S5.1.1.1, S5.1.1.2, S5.1.1.3, and S5.1.1.4. (Only for vehicles that have been tested according to S7.7.2.) (b) For an EV equipped with electrically-actuated service brakes deriving power from the propulsion batteries, and with no automatic shut-down capability of the propulsion motor(s), the propulsion batteries are at an average of not more than five percent above the actual state of charge at which the brake failure warning signal, required by S5.3.1(e) of this standard, is illuminated. Heres how to do a basic check: Start by checking the fluid level in the reservoir. Check the hydro-boost for leaks. 56 0 obj<>
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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. An exhaust brake is a way of slowing the engine down by closing off the exhaust path from the engine, causing the exhaust gases to be compressed in the exhaust manifold and in the cylinder.
John Fay
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. full text search results i think the disc brakes stop beter than air also. (b) The friction surface of the brake, the master cylinder or brake power unit reservoir cover and seal and filler openings, for leakage of brake fluid or lubricant. Title 49 was last amended 2/03/2023. If not, your brakes are fine! 2023 School Bus Fleet Magazine, Bobit. To test the hydraulic brake booster, start by pumping the pedal slowly and evenly until you feel resistance. This contact form is only for website help or website suggestions. S6.7 Ambient temperature. Any electromotive force that is applied to the propulsion motor(s) automatically remains in effect unless otherwise specified by the test procedure. 0000000778 00000 n
S5.1.5.2 (a) After being driven for 2 minutes at a speed of 5 mph in any combination of forward and reverse directions through a trough having a water dept of 6 inches, each vehicle with a GVWR of 10,000 pounds or less shall be capable of making five recovery stops from 30 mph at ten 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 45 pounds more than the average control force for the baseline check (but in no case more than 90 pounds, except that the maximum control force for the fifth stop in the case of a vehicle manufactured before September 1, 1976, shall be not more than plus 60 pounds of the average control force for the baseline check (but in no case more than 110 pounds). The Georgia CDL test consists of 50 questions. Check the fluid level in the hydraulic brake reservoir. If there are any leaks, you should see fluid dripping onto the cardboard or paper below. 1509 (relating to qualifications . 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. If it does, theyll know that the starter switch is working properly. (when the temperature of components on both ends of an axle are averaged). There's a reason big rigs have air brakes! Skid number means the frictional resistance of a pavement measured in accordance with ASTM E274-70 (incorporated by reference, see 571.5) at 40 mph, omitting water delivery as specified in paragraphs 7.1 and 7.2 of that method. Can then be accessed anytime on all of your logged in hydraulic brake test on school bus safety devices - school bus:! Above to view hydraulic brake test on school bus table of contents that this content is from eCFR! 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