CDL AIR BRAKES PRACTICE TEST - MASSACHUSETTS
21.
The supply pressure gauges tell you how much air pressure:
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you are applying to the brakes.
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is in the air tanks.
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is going to the brake chambers.
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is in the air brakes.
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22.
You should NOT use the parking brakes if:
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the brakes are too dry.
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the brakes are cold.
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the brakes are very hot.
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All of the above.
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23.
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 single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.
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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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All of the above.
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24.
When confronted by an aggressive driver, you should:
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make every attempt to get out of their way.
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call the police, if you have a cell phone and can do it safely.
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avoid eye contact.
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All of the above.
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25.
Stepping on and off the brake pedal several times:
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may cause air leaks.
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may result in dangerously thin linings.
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reduces the air pressure in the tanks.
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All of the above.
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