AIR BRAKES CDL PRACTICE TEST - PENNSYLVANIA
11.
Excessive use of the service brakes results in overheating. Too much heat can:
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make the brakes stop working.
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cause the brakes to squeak.
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cause the brakes to grab.
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cause the brakes apply unevenly.
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12.
The air brake lag distance at 55 mph on dry pavement adds about:
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32 feet.
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60 feet.
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75 feet.
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16 feet.
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13.
The total stopping distance for vehicles with air brake systems is made up of __ different factors.
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4
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3
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5
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2
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14.
Front-end header boards:
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protect drivers from spilled cargo.
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reduce traction.
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protect drivers from cargo in case of an accident or emergency stop.
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should never be used.
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15.
When checking air brakes on combination vehicles, which of the following is NOT part of checking that air flows to all trailers?
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Opening the emergency line shut-off valve at the rear of the last trailer.
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Pulling tractor forward until the fifth-wheel comes out from under the trailer.
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Using the trailer handbrake to provide air to the service line.
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Going to the rear of the rig.
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