WA CDL AIR BRAKES PRACTICE TEST
6.
Why must air tanks be drained?
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Water can freeze in cold weather and cause brake failure.
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Water and
oil reduce the air pressure.
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To keep from fouling the air compressor oil.
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7.
The wig wag is:
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a noise reduction mechanism.
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a low air pressure warning system.
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a type of rollover.
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8.
Supply pressure gauges tell drivers:
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how much pressure is in the air tanks.
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how much air pressure they are applying to the brakes.
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All of the above.
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9.
Foundation brakes are used:
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only with the right wheels.
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only with the front wheels.
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at each wheel.
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10.
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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