WI CDL AIR BRAKES PRACTICE TEST
21.
Air tank drains:
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are used to move air to the brakes.
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protect the tanks and the rest of the system from too much pressure.
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should not be used in wet weather.
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are used to remove water and oil from the air tanks.
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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.
In a dual-air system - with engine at operating RPM, the pressure should build from 85 to 100 psi within how many seconds?
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45
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20
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12
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60
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24.
The tractor protection valve:
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will close automatically if the air pressure drops to a certain level.
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provides the air supply for the brake system.
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will close if you apply the parking brakes.
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All of the above.
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25.
If your vehicle is equipped with air brakes, loss of air pressure in the
emergency line causes:
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the trailer spring brakes to come on.
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the speed of your vehicle to increase.
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the trailer emergency brakes to come on.
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All of the above.
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