SC CDL AIR BRAKES PRACTICE TEST
6.
When the air system is fully-charged, the air loss rate for a single vehicle with the engine off should be less than:
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3 psi in one minute.
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2 psi in one minute.
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4 psi in one minute.
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2 psi in 30 seconds.
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7.
If the low pressure warning signal doesn't work:
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this could cause sudden emergency braking in a single-circuit air system.
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you could lose air pressure and you would know it.
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in dual systems the stopping distance will be decreased.
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None of the above.
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8.
Which of the following is NOT part of the drum brake?
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Return spring
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Brake drum
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Axle
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Safety valve
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9.
The spring brakes come on:
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when you lose ABS control.
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when air pressure in both air brake systems rises to a value set by the manufacturer.
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when main air pressure is lost.
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when you bring the vehicle to a complete stop right away.
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10.
Service brakes should:
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always be checked before applying the brakes.
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be checked before each trip.
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only be checked by a mechanic.
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All of the above.
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