CDL AIR BRAKES PRACTICE TEST - SOUTH CAROLINA
21.
When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
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Only while you are taking a rest break.
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Never.
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When the tank pressure falls to the "cut-in" pressure.
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When you are conducting your pre-trip inspection.
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22.
If the ABS is not working:
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you still have normal brake functions.
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the vehicle will have no brakes.
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the vehicle will have weak brakes.
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None of the above.
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23.
Your mirrors should be adjusted so that:
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a part of the vehicle is visible in the mirror.
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the rear of the vehicle is visible in the mirror.
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no part of the vehicle is visible in the mirror.
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more than half of the mirror shows the vehicle.
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24.
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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pump the brakes.
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rev or
lug the engine.
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check the air line connections.
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25.
When you use your mirrors while driving on the road, you should:
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avoid checking them regularly.
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only use the driver's side mirror.
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check them quickly.
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stare for a long time at the mirror.
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