TX CDL AIR BRAKES PRACTICE TEST
21.
Front-end header boards:
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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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should never be used.
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reduce traction.
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22.
The use of air brakes on a steep downgrade is only a supplement to:
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the use of the "controlled braking" method.
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the use of the parking brakes.
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the use of the spring brakes.
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the braking effect of the engine.
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23.
ABS brakes help you:
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find an escape route when the service brakes fail.
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lock up the wheels in an emergency stop.
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avoid wheel lock up.
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downshift before starting down a hill.
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24.
The best way to recognize that your trailer has started to skid is:
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by feeling the brakes come on.
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by seeing it in your mirrors.
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by opening the window and feeling the front of the mirror.
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by recognizing tire failure.
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25.
Slack adjusters:
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are used to adjust the brakes on an air-brake system.
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regulate the distance that the air brake has to travel to apply friction to the wheel.
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are the linkage between the operating rod in the brake chamber and drum brakes or disk brakes in an air brake system.
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All of the above.
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