MISSISSIPPI CDL AIR BRAKES PRACTICE TEST
21.
To check the slack adjusters:
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park downhill and see if the vehicle rolls.
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Park on level ground and chock the wheels, release the parking brakes and pull hard on each slack adjuster. The slack adjuster shouldn't move more than one inch.
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check the air hoses connected to the brake chambers to make sure they aren't cut or worn.
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None of the above.
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22.
Older trailers do not have spring brakes. If the air supply leaks away:
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the trailer will stop normally.
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the ABS won't work properly.
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there will be no emergency brakes.
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All of the above.
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23.
In vehicles with air brakes, water and compressor oil in the bottom of the air tank:
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should be added regularly.
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should be drained completely.
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should not be removed.
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None of the above.
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24.
When the spring brakes are on, you should:
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pump the brakes.
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press the accelerator.
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not push the brake pedal down.
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exceed the posted speed limit.
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25.
If your brakes fail while you are driving on a downgrade, you should:
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immediately start looking outside your vehicle for something to stop it.
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use an escape ramp if it's available.
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take the least hazardous escape route you can.
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All of the above.
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