hydraulic brake test on school bus
Wheels on other axles of the vehicle may be indirectly controlled by the antilock brake system. Comments are moderated and may not appear for 24 hours or more. Some have air brakes but most operators have hydraulic.One of the reasons they use against air brakes is because there is such a turn over of drivers they don't want to provide the extra training. TEST 2: Applied pressure test. The GA CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%).The CDL general knowledge test is required to be taken by all CDL applicants. Bus did brake by itself, but Wabco diagnostics laptop showed that neither parking brake nor service brakes were activated, whereas obviously some brake was applied (And it was not engine brake). Service on the single- or twin-piston caliper is essentially the same. Facebook Page: Blue Bird Corporation Fans. 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. 0000000556 00000 n 36 FR 22902, Dec. 2, 1971, unless otherwise noted. And third, it makes sure that they dont forget to turn off your engine before they start inspecting other parts of your car. This standard applies to multi-purpose passenger vehicles, trucks, and buses with a GVWR greater than 3,500 kilograms (7,716 pounds) that are equipped with hydraulic or electric brake systems. Validyne model P55 differential pressure . Burnish stops are conducted on any surface. Each passenger car and each multipurpose passenger vehicle, truck, and bus with a GVWR of 10,000 pounds or less must be capable of meeting the requirements of S5.1.1 through S5.1.6 under the conditions prescribed in S6, when tested according to the procedures and in the sequence set forth in S7. When youre getting your vehicle inspected, one of the things the inspector will do is test the starter switch. Great prices on 1009 aftermarket and OEM GMC C6500 Topkick auto parts. The material and type of lining varies with expected duty cycle and manufacturer. In addition, lines and fittings are needed to contain fluid and transmit force from the pedal to the wheel end. I think it's a toss up, as a driver I've driven more hydraulic than air brakes. (D) If a separate indicator lamp is provided for application of the parking brake, the single word Park may be used for S5.3.1(d). Comments that include personal If instrument repair, replacement, or adjustment is necessary, make not more than 10 additional stops or snubs after such repair, replacement, or adjustment. 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. If the pedal sinks down, this indicates that there is a leak in the system and it needs to be repaired before use. S6.11 Thermocouples. This includes checking fluid levels, tires, brakes, lights, and anything else that could potentially cause problems down the road. This chapter cited in 22 Pa. Code 51.92 (relating to school bus operators); and 67 Pa. Code 231.8 (relating to additions or modifications to 49 CFR). 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. Clearance Lights - clean, not missing or broken, The second feature is a unique cam design that applies the brake shoe. Where I live (BC Canada) need a special addition to my license for air brakes so I went with hydraulic brakes on my bus. S5.1.3.1 The service brakes on a vehicle equipped with one or more brake power assist units or brake power units, with one such unit inoperative and depleted of all reserve capability, shall be capable of stopping a vehicle from 60 mph within the corresponding distance specified in column IV of table II. This questions appears in the following tests: Colorado Double District Of Columbia Class A Knowledge Test Illinois Passenger Next, start the engine and let it idle for a few minutes to warm up the hydraulic fluid. Inoperative brake power and power assist units. Attain the required deceleration within 1 s and maintain it for the remainder of the snubbing time. S6.2.6 A vehicle equipped with electrically-actuated service brakes also performs the following test series. 25. 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. (b) Service brake system - second effectiveness test. Record the maximum control force for each stop. 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. switch to drafting.ecfr.gov. (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. Restore system to normal at completion of this test. In Florida, anything that has an Air Brake option is so equipped. Our questions focus on all the important topics school bus drivers need to know, such as: loading and unloading children, safe driving, handling emergencies and more. It can also cause corrosion in the brake system. It keeps kids more active. I'll show you my air brakes if you show me yours. Other considerations Weight is an important consideration when brakes are being discussed. With the brakes fully released at all times, drive the vehicle for 2 min at a speed of 5 mph in any combination of forward and reverse directions, through a trough having a water depth of 6 in. The tractor protection valve As a they are hydro boost with a backup electric motor that operates the assist in case of engine failure. 49 CFR 172.101 As part of a routine preventative maintenance program, school bus operators should regularly test their hydraulic brakes. 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). For whatever reason, I feel more in control. The cast disc (rotor) is bolted to the hub assembly. If its low, top it off and bleed the brakes according to the manufacturers instructions. If the pressure is too low, it will not engage the brakes properly. Each modulator may also adjust the brake actuating forces at other wheels that are on the same axle or in the same axle set in response to the same signal or signals. Mounts & Chargers. (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. Drive 1 mi at 30 mph after the last fade stop, and immediately follow the recovery procedure specified in S7.11.3.1. (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. All vehicle openings (doors, windows, hood, trunk, convertible top, cargo doors, etc.) The second thermocouple shall be installed at .080 inch depth within 1 inch circumferentially of the thermocouple installed at .040 inch depth. Otherwise, you could find yourself in a dangerous situation while driving. Engineer: Manuel Maldonado. For S7.3, S7.5, S7.8, S7.15, S7.17, S7.11.1.2, S7.11.2.2, S7.11.3.2, and as required for S7.13, the transmission selector control is in neutral for all decelerations. Wear of the service brake must be compensated for by means of a system of automatic adjustment. 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. 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 parking or emergency brake on a heavy vehicle can only be held into position by something that cannot leak away. S5.2 Parking Brake System. i stand corrected on my hydro brakes in the new bus.. im told all bluebird internationals are 4 wheel disc.. With transmission in neutral (or declutched) make five snubs from 40 to 20 mph at 10 fpsps for each snub. The brake temperature is measured by plug-type thermocouples installed in the approximate center of the facing length and width of the most heavily loaded shoe or disc pad, one per brake, as shown in figure 1. Don't automatically be fooled by big-rigs use of air brakes. Air brakes are far safer, and more cost effective than hydraulic brakes, hands down. to 150 F. 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. There's a reason big rigs have air brakes! Regulation Y Foot or service brakes distance shall, at all times, be . John Fay is school bus marketing manager for Navistar International. 0000000516 00000 n At this point, stop pumping and hold your foot on the pedal for a few seconds. Unless otherwise specified, the force applied to a brake control is not less than 15 lb and not more than 150 lb. The second test is a flow check. If it does, there may be a leak. A split-second delay in brake reaction is present in all air brake systems. S5.1.1.4 In the fourth effectiveness test, a vehicle with a GVWR of 10,000 pounds or less shall be capable of stopping from 30 and 60 mph within the corresponding distances specified in column I of table II. 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. Required fields are marked *. I'll tell you soon.. (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. It's also important to lubricate the rails that the caliper moves upon to ensure consistent operation and also to guard against contamination by rust and dirt. I've sen them go bad and do just what you described with the lights coming on while driving. Electrically-actuated service brakes means service brakes that utilize electrical energy to actuate the foundation brakes. Step on the service brake to make sure the bus doesn't pull to either side. Please do not provide confidential xref (With parking brake released.) Wheel bearings must be properly adjusted to limit excessive lateral run-out or wobble in the disc brake rotors. If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. Air very much does apply the service brake. Determine whether the brake system indicator lamp is activated when the electrical power source to the antilock or variable proportioning unit is disconnected. S5.3.4 When an indicator lamp is activated it may be steady burning or flashing. S6.10.2 For vehicles with a GVWR greater than 10,000 pounds, stops are made with wheel lockup permitted only as follows: (a) At vehicle speeds above 20 mph, any wheel on a nonsteerable axle other than the two rearmost nonliftable, nonsteerable axles may lock up for any duration. S5.3 Brake system indicator lamp. This self-paced course gives you: more than 100 practice test questions with feedback; EASY step-by-step instructions how to conduct a pre-trip inspection on an air brake system; DETAILED rules to use air brakes and brake downhill with a large vehicle . 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