CDL Air Brakes Practice Test - Vermont
21.
To check the slack adjusters:
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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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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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22.
The air compressor governor:
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stops the compressor from pumping air.
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allows the compressor to start pumping air when the tank pressure rises to the "cut-out" pressure.
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controls when the air storage tanks will pump air into the air compressor.
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23.
When backing, you should:
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use the mirrors on both sides.
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back quickly.
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only use mirror on the driver's side.
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24.
Your truck has a dual air system. If either system is very low on pressure:
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the tractor protection valve will not work properly.
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either the front or the rear brake will not be fully operational.
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the low pressure warning signal will stop working.
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25.
A low air pressure warning signal is required on:
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all vehicles with air brakes.
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all vehicles with air brakes built after 2005.
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all vehicles with air brakes built after 2009.
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