PENNSYLVANIA CDL AIR BRAKES PRACTICE TEST
11.
Front brake limiting valves were used to:
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reduce your speed so further braking or shifting is not required.
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prevent overheating of the front tires.
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reduce the chance of the front wheels skidding on slippery surfaces.
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reduce exhaust emissions.
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12.
With air brake vehicles, you should use the parking brakes:
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only during the vehicle inspection test.
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only if your vehicle is equipped with ABS.
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as little as possible.
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whenever you leave the vehicle unattended.
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13.
Why must air tanks be drained?
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The low boiling point of water reduces braking power.
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To keep from fouling the air compressor oil.
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Water can freeze in cold weather and cause brake failure.
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Water and
oil reduce the air pressure.
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14.
The posted speed limit:
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may only be exceeded when driving in rural areas.
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is only a suggestion.
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should only be exceeded when passing other vehicles.
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should never be exceeded.
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15.
When the air pressure is built up to governor cutoff, the air leakage rate for combination vehicles with the engine off and the foot brake fully applied should be less than_____ in one minute.
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5 psi
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2 psi
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3 psi
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4 psi
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