AIR BRAKES CDL PRACTICE TEST - MISSISSIPPI
11.
Parking brakes are:
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required on all vehicles.
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not required on commercial vehicles with air brakes.
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not required on buses.
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not required on trailers.
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12.
Which of the following is NOT a reason for hydraulic brake failure?
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Brake fade on long hills
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Loss of hydraulic pressure
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Stab braking
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All of the above.
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13.
When backing a trailer, you should:
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never make pull-ups to reposition your vehicle.
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try to position your vehicle so you can back in a straight line.
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turn the steering wheel in the direction you want to go.
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avoid correcting the drift.
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14.
How do you check that spring brakes come on automatically?
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On single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.
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On a tractor-trailer combination vehicle, continue to step on and off the brake pedal until the tractor protection valve and the parking brake valve close.
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Continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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All of the above.
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15.
Rough acceleration:
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is recommended during long trips.
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is necessary to warm up the engine.
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can cause mechanical damage.
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improves gas mileage.
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