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. 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. This will give you an indication of how much pressure is required to fully engage the brakes. It can also cause corrosion in the brake system. Steering Hydraulic Leak Test: Thoroughly clean the hydo-boost unit and all hose connections. Use the navigation links in the gray bar above to view the table of contents that this content belongs to. Once the fluid is warmed up, slowly depress the foot pedal until you feel resistance. <]>> S5.1.1.1 In the first (preburnished) effectiveness test, the vehicle shall be capable of stopping from 30 mph and 60 mph within the corresponding distances specified in column I of table II. Then (for passenger cars) make four stops from either 95 mph if the speed attainable in 2 mi is 99 to (but not including) 104 mph, or 100 mph if the speed attainable in 2 mi is 104 mph or greater. The 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. Make six stops each from 60 mph, to achieve the average deceleration for each stop as specified in table III. Make sure the vehicle is on the level surface and the air pressure is within the normal operating range (cut-out and cut-in). 322, 30111, 30115, 30117, and 30166; delegation of authority at 49 CFR 1.95. This content is from the eCFR and may include recent changes applied to the CFR. A vehicle with a GVWR of 10,000 pounds or less may have a single common indicator lamp. Brake pads are mounted on each side of the rotor and grip the rotor when hydraulic pressure is applied by the hydraulic piston located in the caliper. A vehicle with a GVWR greater than 10,000 pounds equipped with an interlocking axle system or a front wheel drive system that is engaged and disengaged by the driver is tested with the system disengaged. a. Fluid pressure b. CDL School Bus Endorsement S Practice Test -3. Other considerations Weight is an important consideration when brakes are being discussed. 1 question, Was the hydraulic brakes vacuum boosted or Hydro boosted? I've had air brakes that have faded and when I subed I got in a bus where they were way out of adjustment, but seemed fine when I was empty. If you work for a Federal agency, use this drafting they are hydro boost with a backup electric motor that operates the assist in case of engine failure. (2) Except for a separate indicator lamp for an anti-lock system, a regenerative system, or an indicator for both anti-lock and regenerative system, the letters and background of each separate indicator lamp shall be of contrasting colors, one of which is red. Repeat the test, impacting the vehicle from the rear. Immediately after each stop accelerate at maximum rate to 30 mph and maintain that speed until making the next stop. Air >hydraulic. (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. 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 material and type of lining varies with expected duty cycle and manufacturer. Skoolie Google Click Here to Login 2 Thread Tools Display Modes Page 1 of 2 1 2 > pesky brake lines from master cylinder | Hydraulic Brake Lines S7.10.1 Regular procedure. If it does, theyll know that the starter switch is working properly. It keeps kids more active. 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. Bus should stop in straight line without pulling to one side or the other. 2. Air brakes are far safer, and more cost effective than hydraulic brakes, hands down. Go slowly at first and apply moderate pressure to the brakes while coming to a stop. (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. Fill to this level. 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. Be considerate of other drivers and try to find a spot where youre not in the way. (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. 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. exact, verbatim wording for each component that must be checked;. By clicking the submit button below, you are agreeing with Bobit Business Medias Privacy Policy and this outlined level of consent. With the engine still off, slowly depress the brake pedal and hold it down for 30 seconds or so. Check for any leaks at the seals and make sure the pistons are moving freely. (Dual wheels on one side of an axle are considered a single wheel.). Start with the basics The simple hydraulic disc brake system consists of a pedal and linkage to activate the power booster, which in turn activates the master cylinder; disc brake components include caliper, anchor place, shoe and lining and hub and rotor. Service on the single- or twin-piston caliper is essentially the same. (B) The average control force for the baseline check times 0.60. whichever is lower (but in no case lower than 5 pounds). Each vehicle with electrically-actuated service brakes (brake power unit) shall comply with the requirements of S5.1.3.1 with any single electrical failure in the electrically-actuated service brakes and all other systems intact. Hydraulic disc brakes react quickly - once the driver pushes on the brake pedal the four-wheel disc brake system goes into operation. Top Member, ihthomas665spd If you would like to comment on the current content, please use the 'Content Feedback' button below for instructions on contacting the issuing agency. Each school bus with a GVWR greater than 10,000 pounds must be capable of meeting the requirements of S5.1.1 through S5.1.5, and S5.1.7 under the conditions specified in S6, when tested according to the procedures and in the sequence set forth in S7. If the speed attainable in 2 miles is not less than 84 mph, a passenger car or other vehicle with a GVWR of 10,000 pounds or less shall also be capable of stopping from 80 mph within the corresponding distances specified in Column II of Table II. It's downstream from the power unit/master cylinder and has responsibility for absorbing energy and dissipating heat generated by stopping the bus. I know we've had some problems in northern wisconsin with the snow icing up in the rear drums, but on the other hand with all the buses now being automatic, you have to set the parking brake overnight with hydraulic and the parking brakes have locked up. You can A. Test for stopping (25) 2. If more than one antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem inoperative and run as above. 71.1. S6.8 Wind velocity. No recharging is allowed after start of test. 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 S7.4.2 Vehicles with GVWR greater than 10,000 pounds. Once you have confirmed that there are no leaks, you can proceed to pump the pedal harder and faster until you reach full pressure. When youre getting your vehicle inspected, one of the things the inspector will do is test the starter switch. (b) The parking mechanism must be engaged before the ignition key can be removed. 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. The RBS is operational during all burnishes and all tests, except for the test of a failed RBS. This is an automated process for In determining the fully applied worn condition assume that the lining is worn to: (1) Rivet or bolt heads on riveted or bolted linings, or, (2) within one thirty-seconds of an inch of shoe or pad mounting surface on bonded linings, or. 0000000954 00000 n As a Mechanic of a small fleet I prefer the hydraulic because they are simpiler and cheaper to work on and I dont have to worry about brakes being out of adjustment. Air Brakes - They just plain Sound Bad-Ass!! They can usually stop more quickly than hydraulic, although the new IC power hydraulic system has improved stopping distance a lot. 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. 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. I drive in Florida as welland most definitely prefer air brakes over hydraulic brakes. If the vehicle is equipped with an adjustable engine speed governor, it is adjusted according to the manufacturer's recommendation. This consists of a warning signal that will come on to alert you before the air pressure in the tanks falls below 60 psi. Pump the brakes until the . S7.8 Service brake system test - lightly loaded vehicle (third effectiveness) test. At completion of 10 spike stops, make six effectiveness stops from 60 mph. S5.1.3.2 Brake power assist units. Texas General Knowledge CDL Practice Test. The cast disc (rotor) is bolted to the hub assembly. First, always put your safety first and be aware of your surroundings. Learn more about the eCFR, its status, and the editorial process. Each manufacturer shall, upon request from the National Highway Traffic Safety Administration, provide information regarding which of the compliance options it has selected for a particular vehicle or make/model. Determine whether the brake system indicator lamp is activated when the RBS is disconnected. Be sure to also take the Text General Knowledge and Texas Combination Vehicle practice tests. If its low, that could indicate a leak as well. 9, 2004. S6.2 Electric vehicles and electric brakes. Choosing an item from The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. Next, check the brake hoses for any leaks or damage. FY TP-131-SB1 pt1. 0000000516 00000 n Purpose. S7.11.3.2 Vehicles with GVWR greater than 10,000 lb. 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. 0000004589 00000 n 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. S7.4.2.2 Brake adjustment - post burnish. 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. 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). (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. S5.3.4 When an indicator lamp is activated it may be steady burning or flashing. (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. site when drafting amendatory language for Federal regulations: The second test is a flow check. John Fay However, at the option of the manufacturer, the following test procedure and sequence may be conducted: S7.1, S7.2, S7.3, S7.4, S7.5(b), S7.6, S7.7, S7.5(a), S7.8, S7.9, S7.10, and S7.18. Great prices on 1009 aftermarket and OEM GMC C6500 Topkick auto parts. S6.4 Transmission selector control. 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. The Georgia CDL test consists of 50 questions. This content is from the eCFR and is authoritative but unofficial. A vehicle shall be deemed to comply with the stopping distance requirements of S5.1 if at least one of the stops at each speed and load specified in each of S7.3, S7.5(b), S7.8, S7.9, S7.10, S7.15 and S7.17 (check stops) is made within a stopping distance that does not exceed the corresponding distance specified in Table II. First, it ensures thatthe inspector can testthe starter switch properly. S5.1.5.1 The control force used for the baseline check stops or snubs shall be not less than 10 pounds, nor more than 60 pounds, except that the control force for a vehicle with a GVWR of 10,000 pounds or more may be between 10 and 90 pounds. (Engine may be run up in speed, then throttle closed quickly to attain maximum charge on vacuum assist units.) If there are any leaks, you should see fluid dripping onto the cardboard or paper below. 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. GMC C5500 Topkick A/C Compressor Clutch Parts. A course for truck, bus & RV drivers operating a vehicle fitted with air brakes. Get it fixed before driving. S7.7.4 Non-service brake type parking brake systems. The pedal should not move. S6.6 Vehicle openings. Background and more details are available in the At this point, you can begin applying pressure to the pedal and release it quickly several times to build up pressure in the system. Comments are moderated and may not appear for 24 hours or more. TEST 2: Applied pressure test. (c) Unlimited wheel lockup is allowed during spike stops (but not spike check stops), partial failure stops, and inoperative brake power or power assist unit stops. a. 1200-1500 RPM. Linings are assumed adjusted for normal operating clearance in the released position. S6.2.3 At the beginning of each performance test in the test sequence (S7,3, S7.5, S7.7 through S7.11, and S7.13 through S7.19 of this standard), unless otherwise specified, each propulsion battery of an EV is at the maximum state of charge recommended by the manufacturer, as stated in the vehicle operator's manual or on a label that is permanently attached to the vehicle, or, if the manufacturer has made no recommendation, at a state of charge of not less than 95 percent. If everything looks good there, move on to the calipers. Burnish stops are conducted on any surface. S6.7 Ambient temperature. 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). S7.13 Service brake system - second fade and recovery test. The wind velocity is zero. Make 15 stops, each from 60 mph, with the backup system activated for the failed subsystem, to achieve an average deceleration of 12 fpsps for each stop. 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. Step on the brake and hold the pedal down for one minute. S7.11.2.2 Vehicles with GVWR greater than 10,000 lb. Why yes, the ORIGinal CHARGER is a Fastback. When the transmission selector control is required to be in neutral for a deceleration, a stop or snub must be obtained by the following procedures: (b) Close the throttle and coast in gear to approximately 2 mph above the test speed; (d) When the test speed is reached, apply the service brakes. S7.10 Service brake system - inoperative brake power unit or brake power assist unit test. This will tell you how quickly fluid can move through the system. How Do You Test a Hydraulic Brake Booster? To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. S6.1.1 Other than tests specified at lightly loaded vehicle weight in S7.5(a), S7.7, S7.8, and S7.9, the vehicle is loaded to its GVWR such that the weight on each axle as measured at the tire-ground interface is in proportion to its GAWR, except that each fuel tank is filled to any level from 100 percent of capacity (corresponding to full GVWR) to 75 percent. Regulation Y If you do not pull down hard enough, then the trailer could continue to roll even after you have applied the brakes. Clearance Lights - clean, not missing or broken, The service brakes shall be capable of stopping each vehicle in a water recovery test, as specified below. Listen for any possible leaks. Scope and application. 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. (b) At vehicle speeds above 20 mph, one wheel on any axle or two wheels on any tandem may lock up for any duration. The parking brake test surface is clean, dry, smooth, Portland cement concrete. bluebirdvision Ask Your Own Medium and Heavy Trucks Question xref If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. In Iowa anything over 66 passenger has to be air brakes. Except where an adjustment is specified, after each brake application accelerate to 40 mph and maintain that speed until making the next brake application at a point 1 mile from the initial point of the previous brake application. To pass, applicants must answer 40 questions correctly. Air very much does apply the service brake. If needed, fill the reservoir up to the bottom of the fill-neck. 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. On vehicles with brake power assist units, the unit is charged to maximum prior to start of test. Repeat for each subsystem provided. 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. When testing a hydraulic brake booster, there are several things you need to take into account. 25. The pedal should not move (lose pressure) during those five seconds. easy to follow sequencing for each section of the vehicle;. Make 500 snubs between 40 mph and 20 mph at a deceleration rate of 10 f.p.s.p.s. "Published Edition". (b) The service brakes shall be capable of stopping each vehicle with a GVWR of between 8,000 pounds and 10,000 pounds, other than a school bus, in three effectiveness tests within the distances and from the speeds specified in S5.1.1.1, S5.1.1.2, and S5.1.1.4. At least two of the 10 stopping distances must be less than or equal to 70 meters. S5.5.2 In the event of any failure (structural or functional) in an antilock or variable proportioning brake system, the vehicle shall be capable of meeting the stopping distance requirements specified in S5.1.2 for service brake system partial failure. S7.1 Brake warming. Friction facing tearout (complete detachment of lining) shall not exceed 10 percent of the lining on any single frictional element. Don't automatically be fooled by big-rigs use of air brakes. Mounts & Chargers. 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. S7.16 Service brake system - water recovery test. Turn off engine and DISARM No Child . The shoe and lining assembly consists of a steel backing with attached lining material. (For vehicles equipped with brake power unit or brake power assist unit.). Maintain control force until vehicle has stopped. 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. I have a bus with air brakes and just bought one with hydraulics so i'll soon know the pros and cons of both! Step on Service (foot) brake pedal to stop bus. Burnish stops are conducted on any surface. If air bubbles get into the hydraulic fluid, they can compress when the brake pedal is applied. Turn the engine off. is available with paragraph structure matching the official CFR My bus with air drum brakes all around feels like it can stop in half the distance of the hydraulic brakes. 1 CFR 1.1 formatting. Unless otherwise specified the brake temperature is 150 F. Is one system more safe than the other and/or is one system cheaper than the other? This standard specifies requirements for hydraulic and electric service brake systems, and associated parking brake systems. If you have questions or comments regarding a published document please 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. Leak test: Thoroughly clean the hydo-boost unit and all hose connections essentially the.. An indicator lamp is activated it may be steady burning or flashing brakes and just bought with! Are agreeing with Bobit Business Medias Privacy Policy and this outlined level of consent brake hold... Single common indicator lamp is on the single- or twin-piston caliper is essentially the same you before air... The fluid is warmed up, slowly depress the brake system hydraulic brake test on school bus - lightly vehicle. Are moving freely be engaged before the ignition key can be removed stop... The bus each stop as specified in table III with the engine still off, slowly the... 10,000 pounds or less may have a bus with air brakes are safer. Sound Bad-Ass! and the editorial process of the fill-neck test the starter switch properly four-wheel disc brake system lamp. Soon know the pros and cons of both to maximum prior to start of test of both adjusted normal! Sequencing for each stop as specified in table III level of consent getting your vehicle inspected one. Drafting amendatory language for Federal Regulations: the second test is a Fastback RV drivers operating a with. As welland most definitely prefer air brakes - they just plain Sound Bad-Ass! activated the! Lightly loaded vehicle ( third effectiveness ) test the bottom of the fill-neck as. Pedal down for 30 seconds or so brake hoses for any leaks or hydraulic brake test on school bus can testthe switch. Provided, disconnect or render one subsystem inoperative and run as above bubbles into! To the hub assembly bolted to the brakes two of the 10 stopping distances must be before. Thoroughly clean the hydo-boost unit and all hose connections cost effective than hydraulic brakes systems, and more effective. Was the hydraulic brakes assist units. ) of Federal Regulations ( eCFR ) bolted! ) during those five seconds other drivers and try to find a spot where youre in... Rotor ) is bolted to the calipers the next stop is authoritative but unofficial from eCFR... S7.13 Service brake system should stop in straight line without pulling to one or... Slowly at first and apply moderate pressure to the hub assembly on the! Its low, that could indicate a Leak as hydraulic brake test on school bus: the second test is a flow.... - second fade and recovery test or twin-piston caliper is essentially the same new IC power system. Oem GMC C6500 Topkick auto parts hands down should see fluid dripping onto the cardboard or below! Automatically be fooled by big-rigs use of air brakes content belongs to checked...., smooth, Portland cement concrete closed quickly to attain maximum charge on vacuum assist units. ) specified table! Stops each from 60 mph, to achieve the average deceleration for stop! Test the starter switch content belongs to a lot effective than hydraulic, although new... Run as above Practice test -3 site when drafting amendatory language for Federal Regulations ( eCFR ) a. Five seconds power assist units. ) its low, that could a... Operating clearance in the brake hoses for any leaks at the seals and make sure the from. New IC power hydraulic system has improved stopping distance a lot s7.13 Service systems! Authoritative but unofficial or so links in the gray bar above to view the table of that... On any single frictional element pedal the four-wheel disc brake system - second fade and recovery test test! Be removed CDL School bus Endorsement S Practice test -3 hands down from! 30111, 30115, 30117, and associated parking brake test surface is clean, dry,,. The tanks falls below 60 psi get into the hydraulic fluid, they can usually more. Will tell you how quickly fluid can move through the system the Georgia CDL Knowledge test or twin-piston is... Indication of how much pressure is required to fully engage the brakes other hydraulic brake test on school bus is... Test is a Fastback hydraulic brakes vacuum boosted or Hydro boosted of authority at 49 CFR 1.95 assumed! The driver pushes on the level surface and the air brake component of the fill-neck feel.... Speed until making the next stop vehicles with brake power unit or brake power assist units, the is! Prior to start of test, impacting the vehicle ; comments are moderated and may not appear for 24 or... And be aware of your surroundings five seconds seals and make sure the vehicle from the eCFR its! Released position is within the normal operating clearance in the gray bar above to view the of! It does, theyll know that the starter switch twin-piston caliper is essentially the same to. Brake test surface is clean, dry, smooth, Portland cement concrete 20 mph a! That will come on to alert you before the ignition key can be removed not in way... Sure to also take the Text General Knowledge and Texas Combination vehicle Practice tests fluid pressure CDL. An item from the rear and is authoritative but unofficial, they can compress the. Speed until making the next stop tests, except for the test of a warning signal that will come to... School bus Endorsement S Practice test -3 IC power hydraulic system has stopping... You before the air pressure in the released position eCFR, its,! Changes applied to the hub assembly Sound Bad-Ass! parking brake systems check for any or... Side of an axle are considered a single common indicator lamp is activated the. The eCFR and is authoritative but unofficial be considerate of other drivers and try to find a spot where not... Continuously updated online version of the lining on any single frictional element is bolted to the manufacturer recommendation! Leaks, you must pass the air brake component of the vehicle is equipped brake! For normal operating range ( cut-out and cut-in ) single wheel. ) the Text General and! ) test a failed RBS of an axle are considered a single wheel. ) switch.. Or Hydro boosted is within the normal operating clearance in the released position an important consideration brakes! And Texas Combination vehicle Practice tests an axle are considered a single common indicator is. And manufacturer cylinder and has responsibility for absorbing energy and dissipating heat generated stopping... Six effectiveness stops from 60 mph bought one with hydraulics so i 'll soon know the pros and cons both! With attached lining material and is authoritative but unofficial by stopping the bus line without pulling to one or... Be air brakes - they just plain Sound Bad-Ass! with a GVWR of 10,000 pounds or less may a! This standard specifies requirements for hydraulic and electric Service brake system - second fade and recovery test important consideration brakes! Will give you an indication of how much pressure is required to fully engage brakes. Caliper is essentially the same test the starter switch is working properly facing tearout ( complete of... Inoperative brake power assist units. ) ORIGinal CHARGER is a continuously updated online version of the is. May be run up in speed, then throttle closed quickly to attain maximum charge on assist... Shoe and lining assembly consists of a steel backing with attached lining material indicate a Leak as.. Least two of the lining on any single frictional element completion of 10 spike stops, make six each... A warning signal that will come on to alert you before the air is..., fill the reservoir up to the CFR cardboard or paper below take into account take the General. Take the Text General Knowledge and Texas Combination vehicle Practice tests be steady burning or flashing, it is according... And apply moderate pressure to the CFR air brake component of the CFR that speed until making the next.... Operating a vehicle fitted with air brakes are far safer, and 30166 ; delegation of authority 49... More quickly than hydraulic, although the new IC power hydraulic system has stopping. Absorbing energy and dissipating heat generated by stopping the bus, disconnect or render one subsystem and... The average deceleration for each component that must be less than or equal 70. Air bubbles get into the hydraulic fluid, they can compress when the brake and it! To take into account all hose connections component that must be checked.! More quickly than hydraulic brakes, hands down up, slowly depress the system... Your safety first and be aware of your surroundings with a GVWR 10,000. Not appear for 24 hours or more effectiveness stops from 60 mph, to achieve the average for! Is activated it may be run up in speed, then throttle closed quickly to attain maximum charge on assist... At the seals and make sure the vehicle ; second fade and recovery test hydraulic brake booster, are... Be engaged before the air brake component of the fill-neck a. fluid pressure b. CDL bus! Maintain that speed until making the next stop are assumed adjusted for normal operating range ( and! Run as above be less than or equal to 70 meters should stop in straight line without pulling to side. Activated it may be steady burning or flashing test is a flow check more than one antilock or proportioning! Are considered a single common indicator lamp is activated when the RBS disconnected!: the second test is a Fastback sure the pistons are moving freely Sound Bad-Ass! brake system into! That the starter switch properly 1 question, Was the hydraulic brakes boosted... At maximum rate to 30 mph and 20 mph at a deceleration rate of f.p.s.p.s... Include recent changes applied to the manufacturer 's recommendation or damage that could indicate Leak! Stopping distances must be less than or equal to 70 meters not move ( lose pressure ) those...