AIR BRAKES CDL PRACTICE TEST - VERMONT
21.
The Johnson bar is a valve that:
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reduces the braking pressure to a safe level.
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is installed in the first tank the air compressor pumps air to.
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works the trailer brakes.
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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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you could lose air pressure and you would know it.
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None of the above.
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23.
When going down a steep downgrade, you should:
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avoid braking and rely on engine braking.
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use the parking brake.
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use a low gear, and a proper braking technique.
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24.
Which of the following is NOT part of the air brake system?
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Emergency brake system
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Anti-lock brake system
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Parking brake system
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25.
Front wheel braking is good:
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only in wet conditions.
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under all conditions.
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Never.
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