AIR BRAKES CDL PRACTICE TEST - DISTRICT OF COLUMBIA
21.
An alcohol evaporator:
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to hold compressed air.
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protects the air brake system from too much pressure.
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used to reduce the chance of the front wheels skidding.
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is used to reduce the risk of ice in air brake valves and other parts during cold weather.
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22.
If the low air pressure warning light comes on, you should:
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call for help.
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set the parking brake.
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stop immediately.
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continue to drive normally.
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23.
The safety relief valve is usually set to open at ____ psi.
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50
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75
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100
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150
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24.
If you are driving a 30-foot vehicle at 55 mph, you should leave at least _____ between you and the vehicle ahead.
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2 seconds
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5 seconds
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4 seconds
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3 seconds
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25.
You are driving on a steep downgrade. If your safe speed is 35 mph, you should apply the brakes when your speed reaches:
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30 mph
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45 mph
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25 mph
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35 mph
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