CDL Air Brakes Practice Test - Maine
11.
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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20
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12
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45
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12.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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shutting the engine off so you can hear the brakes.
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All of the above.
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13.
When driving on long and/or steep downgrades, to select an appropriate safe speed you should consider:
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the total weight of the vehicle and cargo.
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the road conditions.
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All of the above.
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14.
Air brakes:
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are an effective way to stop large and heavy vehicles.
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are prohibited on larger vehicles.
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should be used only when driving on wet roads.
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15.
With the air pressure built up to governor cutoff, the maximum leakage rates per minute are ___ psi for single vehicles and ___ psi for a combination of 2 vehicles.
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5; 6
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3; 4
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3; 2
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