AIR BRAKES PRACTICE TEST - INDIANA
21.
The safety valve is usually set to open at:
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100 psi
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200 psi
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150 psi
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125 psi
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22.
If the low pressure warning signal doesn't work:
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this could cause sudden emergency braking in a single-circuit air system.
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in dual systems the stopping distance will be decreased.
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you could lose air pressure and you would know it.
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None of the above.
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23.
As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
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a mechanical vibration.
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a thumping sound.
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the service line valve close.
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air escaping from the open valve.
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24.
How do you check that spring brakes come on automatically?
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Continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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On a tractor-trailer combination vehicle, continue to step on and off the brake pedal until the tractor protection valve and the parking brake valve close.
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On single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.
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All of the above.
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25.
If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
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loose.
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worn.
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cracked.
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tight.
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