OKLAHOMA CDL AIR BRAKES PRACTICE TEST
16.
If the spring brakes do not release when you push the trailer air supply control, you should:
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check the electrical cables.
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rev or
lug the engine.
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check the air line connections.
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17.
To apply the parking brakes:
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place the parking brake control knob in Neutral.
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push the parking brake control knob in.
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pull the parking brake control knob out.
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18.
The application pressure gauge shows:
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how much air pressure you are applying to the brakes.
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how much pressure is in the air tanks.
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All of the above.
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19.
Empty trucks have the best braking. True or False?
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It depends on the cargo.
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True.
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False.
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20.
You should drain the air tanks completely. If water and oil collect in the air tanks:
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your brakes could become hard to press.
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your brakes could heat up.
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your brakes could fail.
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