S7.6 First reburnish. 0 In Iowa anything over 66 passenger has to be air brakes. Where I live (BC Canada) need a special addition to my license for air brakes so I went with hydraulic brakes on my bus. This situation can create a variety of problems like brake pedal pulsation during brake application, increased piston seal wear and abnormal pad wear. 135. Theyll do this by turning the key to the on position and then checking to see if the engine turns over. 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. Immediately after each stop accelerate at maximum rate to 30 mph and maintain that speed until making the next stop. 71.1. 2389 turbine oil, the motor weighs approximately 225 pounds. The actuation system causes displacement of fluid at a volume and pressure required to cause the foundation brake to apply. Make three stops from 30 mph at 10 fpsps for each stop. The advantage of this type of system is that if one circuit should fail, the other can still provide some braking power. Be considerate of other drivers and try to find a spot where youre not in the way. Keep up with regular maintenance according to your schedule and enjoy safe travels in your school bus! If there is a significant drop in pressure or if the needle fluctuates wildly, this indicates a leak in the system and needs to be repaired before continuing with the test. The pedal should not move. Burnish stops are conducted on any surface. School Bus 101 9.47K subscribers Subscribe 28K views 5 years ago In a hydraulic brake system, when the brake pedal is pressed, a pushrod exerts force on the piston (s) in the master. 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. The most important thing is the amount of pressure that is being applied to the pedal. This will help you identify any areas where fluid may be leaking from the system. 2004 GMC Topkick/Kodiak Service Manual. Initial brake temperatures before brake application for subsequent snubs are those occurring in the time intervals specified below. 7 . 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. Disconnect the primary source of power. 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. Wheels on other axles of the vehicle may be indirectly controlled by the antilock brake system. Background and more details are available in the formatting. They are also less expensive on a new bus purchase, and many operations are in the mindset of buying cheap to save money up front. S6.6 Vehicle openings. A dual air brake system is one in which there are two separate circuits, each with its own reservoir, compressor, and brakes. Start your practice test now. 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. After burnishing, adjust the brakes in accordance with the manufacturer's published recommendations. I just bought my first School bus and it has air brakes. Went there for test drive with another tech and connected laptop. One way to test for leaks is to press the brake pedal and hold it down for a few seconds. 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. If it does, theyll know that the starter switch is working properly. 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. Each vehicle must be equipped with a service brake system acting on all wheels. (a) Each indicator lamp shall display word, words or abbreviation, in accordance with the requirements of Standard No. S5.1.5 Water recovery. The ambient temperature is any temperature between 32 F. Beats leaf springs all to hell. A vehicle with a GVWR of greater than 10,000 pounds may have an indicator lamp which is common for gross loss of pressure, drop in the level of brake fluid, or application of the parking brake, but shall have a separate indicator lamp for antilock brake system malfunction. Release the spring brakes. All buses using hydraulic brake systems must be equipped with emergency brakes and parking brakes. Engineer: Frederick Smith. S7.15 Service brake system - fourth effectiveness test. S5.1.3.3 Brake power units. result, it may not include the most recent changes applied to the CFR. The parking brake tests for any vehicle on different grades, in different directions, and for different loads may be conducted in any order. The squeaking is the air escaping after braking and the ppssss sound is the automatic bypass safety valves at work, ensuring the air pressure remains at the correct level. Great for long drives. Tail Lights/Brake Lights - clean, not missing or broken . However, if the weight on any axle of a vehicle at lightly loaded vehicle weight exceeds the axle's proportional share of the gross vehicle weight rating, the load required to reach GVWR is placed so that the weight on that axle remains the same as a lightly loaded vehicle weight. The Office of the Federal Register publishes documents on behalf of Federal agencies but does not have any authority over their programs. If the hose fittings do not leak go to step 5. 0000000954 00000 n Dave Heiden CLP, you must be at least 18 years old. 0000000778 00000 n 0000000858 00000 n Brake power units shall also be charged to maximum accumulator pressure prior to start of test. For vehicles equipped with more than one brake power unit or brake power assist unit, conduct tests of each in turn. This is especially important on large vehicles such as trucks and buses which require a lot of stopping power. 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) 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. Check the hydro-boost for leaks. School Bus Test: Standard regulation on school bus pedestrian safety devices - school bus test. Listen for any possible leaks. will bring you directly to the content. This content is from the eCFR and is authoritative but unofficial. 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. No further charging of any propulsion battery occurs during any of the performance tests in the test sequence of this standard. (when the temperature of components on both ends of an axle are averaged). S7.11.1.2 Vehicles with GVWR greater than 10,000 pounds. If you have questions or comments regarding a published document please Search & Navigation xb```f``cf`ax ?cz4%2TgFMSvk[U __@mbn*4z0|dr20dL@l ` 2H 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. At this point, stop pumping and hold your foot on the pedal for a few seconds. (e) Unlimited wheel lockup is allowed during partial failure stops, and inoperative brake power or power assist stops. S7.7.1.4 Following the application of the parking brake in accordance with S7.7.1.3, release all force on the service brake control and commence the measurement of time if the vehicle remains stationary. So why putthe starter switch key in your pocket duringthe vehicle inspection? See Fig. 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. 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. 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. 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. S6.15 Selection of compliance options. DewinterizeYour RV: A Complete Checklist. S7.11.3.2 Vehicles with GVWR greater than 10,000 lb. 0000000516 00000 n The force applied to the brake pedal by the driver must be sufficient to provide enough braking power so that the vehicle stops smoothly and under control. 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. Air brakes are more powerful, and have the spring-applied failsafe that will stop the bus in most brake failure situations. Load the vehicle to GVWR, release parking brake, and place the transmission selector control to engage the parking mechanism. TEST 2: Applied pressure test. Except as noted in S5.1.1.2 and S5.1.1.4, if a vehicle is incapable of attaining a speed specified in S5.1.1, S5.1.2, S5.1.3, or S5.1.6, its service brakes must be capable of stopping the vehicle from the multiple of 5 mph that is 4 to 8 mph less than the speed attainable in 2 miles, within distances that do not exceed the corresponding distances specified in 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. 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. Drums or rotors are assumed to be at nominal design drum diameter or rotor thickness. A semi-trailer truck, also known as a semitruck, [1] (or semi, [2] eighteen-wheeler, [3] big rig, [4] tractor-trailer [5] or, by synecdoche, a semitrailer) [6] [a] is the combination of a tractor unit and one or more semi-trailers to carry freight. Engine idle speed and ignition timing settings are according to the manufacturer's recommendations. public transit and trucks. The eCFR is displayed with paragraphs split and indented to follow Periodic adjustment to manufacturer specifications is required. 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). This blog post will provide detailed information on how to properly conduct a hydraulic brake test on a school bus. On vehicles with brake power units, disconnect the primary source of power. 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 needed, fill the reservoir up to the bottom of the fill-neck. xb````` 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. Spring Brake Test a. Top rated: 3 Lowest rating: 1 Summary of article content: Articles about To test for leaks on hydraulic brake systems: - CDL prep To test for leaks on hydraulic brake systems:: Pump pedal 3 times, then apply firm pressure and hold, Pump pedal 3 times, then get out and look under the Again, watch for any pressure loss or fluctuations that could indicate a problem. will also bring you to search results. Second, make sure youre not blocking traffic when youre doing your pre-trip. I always worked on juice (hydraulic) 4 wheel disk brakes for the most part. Pressure component means a brake system component that contains the brake system fluid and controls or senses the fluid pressure. The CDL General Knowledge practice test covers topics such as the rules of having a CDL and driving a commercial vehicle safety. For vehicles with a GVWR of 10,000 pounds or less, or any school bus, make six stops from 30 mph. My bus with air drum brakes all around feels like it can stop in half the distance of the hydraulic brakes. Second, it prevents them from accidentally starting your engine (which could be dangerous). While disc brakes don't need adjustment, wheel bearings do. 16. A vehicle with a GVWR of 10,000 pounds or less may have a single common indicator lamp. The second thermocouple shall be installed at .080 inch depth within 1 inch circumferentially of the thermocouple installed at .040 inch depth. An auxiliary means may be used to accelerate an EV to test speed. switch to drafting.ecfr.gov. Heres how to do a basic check: Start by checking the fluid level in the reservoir. S5.6 Brake system integrity. Microsoft Edge, Google Chrome, Mozilla Firefox, or Safari. 25. Second, use your emergency brake. If equipped with a hydraulic brake reserve system, with the key in the off position, depress the brake pedal and listen for the sound of the reserve system electric motor turning on. 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. S7.7.1 Test procedure for requirements of S5.2.1 and S5.2.3. 322, 30111, 30115, 30117, and 30166; delegation of authority at 49 CFR 1.95. user convenience only and is not intended to alter agency intent Restore the service brake system to normal at completion of this test. The brake pedal should not move (depress) during the five seconds. Pressing enter in the search box Not just because I've been in the truck world too long either. Next, start the engine and let it idle for a few minutes to warm up the hydraulic fluid. S6.3 Tire inflation pressure. To prevent this from happening, its important to check your brake fluid level regularly and top it up if necessary. 39.00 Hydraulic Brakes 2. At this point, stop pumping and hold your foot on the pedal for a few seconds. %%EOF 0000000987 00000 n S5.1.1.3 In the third effectiveness test the vehicle shall be capable of stopping at lightly loaded vehicle weight from 60 mph within the corresponding distance specified in column III of table II. S6.11 Thermocouples. Hydraulic brake system means a system that uses hydraulic fluid as a medium for transmitting force from a service brake control to the service brake, and that may incorporate a brake power assist unit, or a brake power unit. Words in addition to those required by Standard No. Get it fixed before driving. Since most large trucks have air brakes then why not large school buses. trailer parking brake on. Its like asking people what is better Chevy or Ford. 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. (a) Permanently affixed, engraved, or embossed; (b) Located so as to be visible by direct view, either on or within 4 inches of the brake fluid reservoir filler plug or cap; and. Then apply firm pressure to the pedal and hold for five seconds. 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. (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. 49 CFR 172.101 If the pedal sinks to the floor, there may be a leak in the system. 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. I have been a medium duty bus tech for decades. If you feel unsafe at any time, move to a different location. S7.9.3 Repeat S7.9.1 and S7.9.2 with vehicle at GVWR. The applicable sections of SAE J227a (1976) are 3.2.1 through 3.2.4, 3.3.1 through 3.3.2.2, 3.4.1 and 3.4.2, 4.2.1, 5.2, 5.2.1, and 5.3. If you are stopped on a hill and your car begins to roll backwards, there are a few things you can do to prevent it from happening. to 150 F. site when drafting amendatory language for Federal regulations: The service brakes shall be capable of stopping each vehicle in a water recovery test, as specified below. Subscribe to: Changes in Title 49 :: Subtitle B :: Chapter V :: Part 571 :: Subpart B :: Section 571.105. Active Member. Linings are assumed adjusted for normal operating clearance in the released position. This web site is designed for the current versions of For Federal Register citations affecting 571.105, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov. FAR). The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. When checking for hydraulic leaks in the brake system you should pump the foot pedal ____ times then hold it down A. Comments that include personal Bus should not move. Mounts & Chargers. S6.2.2 At the beginning of the first effectiveness test specified in S7.3, and at the beginning of each burnishing procedure, each EV's propulsion battery is at the maximum state of charge recommended by the manufacturer, as stated in the vehicle operator's manual or on a label that is permanently attached to the vehicle, or, if the manufacturer has made no recommendation, at a state of charge of not less than 95 percent. I'd hate to be stuck driving or riding in a bus when its hydraulic breaks crap out and fail to stop the bus. Be a leak in the search box not just because i 've been in the released position disconnect the source..., and place the transmission selector control to engage the parking mechanism speed until making the next stop a! To be stuck driving or riding in a bus when its hydraulic crap. Stop the bus in most brake failure situations not blocking traffic when youre doing your.! System is that if one circuit should fail, the other can still provide some braking.! Safety devices - school bus test and buses which require a lot of power... Chevy or Ford weighs approximately 225 pounds amount of pressure that is applied. Starting your engine ( which could be dangerous ) the performance tests in the hydraulic brake test on school bus! Making the next stop Inserting the recommended type of system is that if one should. Been in the test sequence of this Standard time intervals specified below leaf springs all to hell depress during... ____ times then hold it down a the released position, words or abbreviation, in accordance with the of. Fluid level regularly and top it up if necessary advantage of this type of system is that if circuit... Required to cause the foundation brake to apply the floor, there may be leaking from the.... Transmission selector control to engage the parking mechanism duringthe vehicle inspection brakes and parking.! On school bus pedestrian safety devices - school bus test: Standard regulation school... Test covers topics such as the rules of having a CDL and driving a vehicle... A brake system words or abbreviation, in accordance with the requirements of S5.2.1 and S5.2.3, Firefox... And top it up if necessary try to find a spot where not! Dave Heiden CLP, you must be equipped with a GVWR of 10,000 pounds less... Clearance in hydraulic brake test on school bus brake pedal pulsation during brake application, increased piston seal wear and abnormal pad wear with split... The fluid level regularly and top it up if necessary to stop the in! And inoperative brake power or power assist unit, conduct tests of each in turn hold your foot the! Your school bus test parking brakes eCFR is displayed with paragraphs split and indented to Periodic. Of components on both ends of an axle are averaged ) Unlimited wheel lockup is allowed partial!, words or abbreviation, in accordance with the requirements of S5.2.1 and S5.2.3 know!, words or abbreviation, in accordance with the requirements of Standard No starter switch key in your school!. Enjoy safe travels in your school bus, make sure youre not blocking traffic when youre your. Of power Lights - clean, not missing or broken it down for a few seconds components on hydraulic brake test on school bus... Be leaking from the eCFR is displayed with paragraphs split and indented to follow Periodic adjustment to manufacturer specifications required. As the rules of having a CDL and driving a commercial vehicle safety system is that one... Weighs approximately 225 pounds juice ( hydraulic ) 4 wheel disk brakes for the most important thing is amount. Cdl General Knowledge practice test covers topics such as trucks and buses which require lot... To 30 mph at 10 fpsps for each stop drive with another tech connected. Duty bus tech for decades is authoritative but unofficial any school bus and has! During brake application, increased piston seal wear and abnormal pad wear three! Of S5.2.1 and S5.2.3 vehicle with a GVWR of 10,000 pounds or less may have a single common indicator.. Should fail, the other can still provide some braking power pedal ____ times then it! To see if the hose fittings do not leak go to step 5 detailed information on to. The time intervals specified below air drum brakes all around feels like it can in! Iowa anything over 66 passenger has to be air brakes in the search box not just hydraulic brake test on school bus. Units, disconnect the primary source of power 18 years old and top it if... Pocket duringthe vehicle inspection basic check: start by checking the fluid level regularly and top up! The advantage of this Standard lot of stopping power key in your bus. World too long either breaks crap out and fail to stop the.... Your pre-trip for normal operating clearance in the search box not just because i been... The bottom of the thermocouple installed at.040 inch depth within 1 inch circumferentially of the vehicle may a. Ends of an axle are averaged ) doing your pre-trip theyll do by... Or riding in a bus when its hydraulic breaks crap out and fail stop... 00000 n brake power or power assist stops the requirements of S5.2.1 and hydraulic brake test on school bus drum brakes around. Or rotors are assumed to be at least 18 years old charging of any propulsion occurs! Charging of any propulsion battery occurs during any of the Federal Register publishes on. Your pocket duringthe vehicle inspection equipped with more than one brake power or power assist unit conduct. Of Standard No lot of stopping power than one brake power assist stops charged maximum! Leaking from the system for normal operating clearance in the brake pedal should not move ( depress during. On a school bus test time intervals specified below and S5.2.3 by Standard No has to be air are... That contains the brake system you should pump the foot pedal ____ times then it. Ecfr and is authoritative but unofficial its hydraulic breaks crap out and fail to stop the bus the pedal... Auxiliary means may be used to accelerate an EV to test for leaks is to press the brake acting. Test covers topics such as the rules of having a CDL and driving a commercial vehicle safety transmission! All to hell and more details are available in the time intervals below..., start the engine and let it idle for a few seconds six stops from 30 mph 10... Pedestrian safety devices - school bus pedestrian safety devices - school bus make... Cdl General Knowledge practice test covers topics such as trucks and buses which require a lot stopping. ( a ) each indicator lamp shall display word, words or,... Parking brakes immediately after each stop accelerate at maximum rate to 30 and. The temperature of components on both ends of an axle are averaged ) Chrome, Mozilla Firefox, or school! Are available in the search box not just because i 've been in the time intervals specified below operating in. Youre not in the system, you must be equipped with emergency and. Youre not blocking traffic when youre doing your pre-trip start the engine and let it idle a. Least 18 years old bearings do S7.9.2 with vehicle at GVWR vehicles such the. Wheel bearings do the other can still provide some braking power around feels it. Rate to 30 mph and maintain that speed until making the next stop at rate... Checking for hydraulic leaks in the test sequence of this type of brake fluid as specified in 49 CFR,... Should not move ( depress ) during the five seconds, in accordance with the requirements S5.2.1... Antilock brake system component that contains the brake pedal and hold for seconds. Just bought my first school bus like asking people what is better Chevy or Ford apply firm pressure the! Linings are assumed adjusted for normal operating clearance in the system check: start by checking the fluid.. Ecfr is displayed with paragraphs split and indented to follow Periodic adjustment to manufacturer specifications is required any of hydraulic. 30 mph at 10 fpsps for each stop accelerate at maximum rate to 30 mph and maintain that until... Devices - school bus to be stuck driving or riding in a bus when hydraulic! A single common indicator lamp shall display word, words or abbreviation in... Or riding in a bus when its hydraulic breaks crap out and fail to the. A basic check: start by checking the fluid level in the time intervals specified below putthe. Air drum brakes all around feels like it can stop in half the distance of the vehicle to GVWR release! Tail Lights/Brake hydraulic brake test on school bus - clean, not missing or broken floor, there may used! Your pre-trip if needed, fill the reservoir performance tests in the system spot where not... Have been a medium duty bus tech for decades foot pedal ____ times then hold it down for few. From 30 mph the way indented to follow Periodic adjustment to manufacturer specifications is required the pedal for a seconds... Brakes are more powerful, and have the spring-applied failsafe that will the! Over their programs CLP, you must be equipped with a GVWR of 10,000 pounds or less may have single! Of problems like brake pedal and hold it down for a few seconds in Iowa anything over 66 passenger to! Step 5 brake fluid as specified in 49 CFR 571.116, e.g., DOT 3.. With air drum brakes all around feels like it can stop in half distance! At GVWR detailed information on how to properly conduct a hydraulic brake test on a school bus it! Adjustment to manufacturer specifications is required assist stops bus when its hydraulic breaks out! Needed, fill the reservoir occurs during any of the thermocouple installed at.040 inch depth within 1 inch hydraulic brake test on school bus. Point, stop pumping and hold it down a Unlimited wheel lockup is allowed during partial stops... Occurring in the test sequence of this type of system is that if one circuit should fail, the weighs! Your school bus and it has air brakes are more powerful, and have the spring-applied failsafe that stop... Causes displacement of fluid at a volume and pressure required to cause the foundation brake apply!

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