CDL AIR BRAKES PRACTICE TEST - OKLAHOMA
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.
ABS:
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allows you to brake harder.
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should only be used on dry roads.
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is an addition to your normal brakes.
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8.
During a trip you should check:
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pressure gauges.
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temperature gauges.
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All of the above.
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9.
Older trailers do not have spring brakes. If the air supply leaks away:
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the ABS won't work properly.
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there will be no emergency brakes.
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the trailer will stop normally.
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10.
If a vehicle is equipped with ABS, when you start the engine:
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the ABS indicator light on the dash should come on and then turn off.
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the spring brakes will come on.
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the wheels will lock up.
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