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16 Cards in this Set
- Front
- Back
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What should I do just to be safe on the test that Marty mentioned?
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Chock the wheels!
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What do I do with the static leakage test?
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Release all breaks, including the parking break. Charge the system full to cut out! Let system settle. Turn off engine. Time for 1 minute to see if PSI drops. It shouldn't drop more than 2 psi for singles, 3 for doubles, 5 for tripples.
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What do I need to remember about the static leakage test that I forget?
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It's a test that has all breaks released. No breaks at all are on!
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What do I need to do with the Applied Leakage Test? (This one must be performed!)
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CHOCK THE VEHICLE! Release all breaks and let system charge to cut out fully! Turn engine off and let system settle. Now apply pressure to the service break pedal. Time it for 1 minute! It shouldn't leak more than 3 psi for singles, 4 psi for doubles, 6 psi for triples.
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What do I need to say during the applied leakage test?
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The vehicle is chocked. I'm releasing all breaks and going to build pressure to cut out. Now that the truck is cut out I'm turning it off to perform the applied test. We wait one minute. I'm applying pressure to the breaks, now and starting my timer. The PSI should not drop more than 3 for a single which is what we have, 4 for a double and 6 for three or more.
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What do I need to do with the Air Compressor Governor Cut-Out Pressure test? (This one must be performed!)
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Air pressure must be rising when engine is running. Just wait until it reaches the 125 mark and I hear the break release sound. Let the examiner know it cut out and the pressure it cut out at. The maximum pressure is 130 to cut out, mention that to!
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What do I say when doing the Air compressor governor Cut-Out pressure test?
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I'm looking for the cut out of the air compressor. It's building right now. It just cut out at 125ish. The maximum cut out is 130 psi.
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What do I need to do with the Air Compressor Governor cut-in pressure test? (This one must be performed!)
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Make sure that the compressor has cut out already. Slowly pump the breaks watching the needle. As I approach 90 psi on our trucks it's when they cut-in. Slow down when nearing that PSI and watch needle rise. Let the examiner know when it cuts in. Also mention that it must cut in before 85 psi!
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What do I need to say with the Air Compressor cut-in test?
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I'm making sure the pressure has stabilized and cut-out. I'm slowly pumping the breaks down to see where it cuts in. These trucks normally cut-in around 90 psi. The minimum cut in is 85 psi. It just cut in around 90ish on both tanks.
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What do I need to do with the Low Air Pressure Warning Device Test? (This one must be performed)
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The engine can be on or off but off is probably easier. Keys need to be on though for power. Pump the pedal to reduce break pressure. Low pressure warning sound must activate between 55 and 75 psi.
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What do I need to say with the Low Air Pressure Warning Device Test?
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I'm going to test the low air pressure warning. The easiest way is with the key on and engine off. The truck warning went off at 70 ish. It must activate within the 55 to 75 psi range.
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What do I need to do to Check that the spring brakes come on automatically? (This one must be performed)
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Make sure the wheels are chocked. Turn off the engine and release the parking break, PUSHED IN as if driving! Pump the brakes to reduce air pressure. The know will pop out at a certain psi. The normal range is 20 to 45 psi.
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What should I say with the springs brake auto come on test?
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I'm going to test to make sure the spring breaks automatically come on at low pressure. The normal range is 20 to 45 psi. The brake poped out at 25 psi.
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What do I do to check the rate of air pressure buildup?
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At operating rpms, it should build from 85 psi to 100 psi in 45 seconds.
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What do I do to test the service brakes?
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Make sure chocks are removed. Put seat belt on. Wait for normal air pressure. Release the parking brake. Let the vehicle move forward slow about 5 mph. Apply the brakes firmly.
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What do I do to test the parking brake?
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Make sure the chocks are removed. Set the parking brake. Try to move the vehicle by pressing on the gas.
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