CDL Air Brakes Practice Test - Kansas
21.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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20 to 45 psi
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100 to 120 psi
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50 to 75 psi
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10 to 20 psi
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22.
While driving, you should use your mirrors to:
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check the condition of the tires and cargo.
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check where the rear of your vehicle is while you make turns.
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know where other vehicles are around you.
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All of the above.
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23.
ABS malfunction lamps are located:
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on the driver'door.
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on the instrument panel.
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under the hood.
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None of the above.
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24.
Empty trucks have the best braking. True or False?
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It depends on the truck.
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False.
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True.
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It depends on the cargo.
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25.
Combination vehicles have __ air lines.
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4
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2
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1
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3
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