AIR BRAKES CDL PRACTICE TEST - VIRGINIA
21.
Front-end header boards:
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should never be used.
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protect drivers from cargo in case of an accident or emergency stop.
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protect drivers from spilled cargo.
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22.
ABS:
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makes it easier to break.
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helps you avoid wheel lock up.
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allows the wheels to lock up.
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23.
The most common foundation brakes found on vehicles with air brakes are the:
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disc brakes.
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S-cam brakes.
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wedge brakes.
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24.
When backing, you should:
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back quickly.
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only use mirror on the driver's side.
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use the mirrors on both sides.
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25.
If the spring brakes do not release when you push the trailer air supply control, you should:
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check the air line connections.
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check the electrical cables.
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rev or
lug the engine.
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