DISTRICT OF COLUMBIA CDL AIR BRAKES PRACTICE TEST
6.
The posted speed limit:
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is only a suggestion.
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may only be exceeded when driving in rural areas.
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should never be exceeded.
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should only be exceeded when passing other vehicles.
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7.
If a vehicle is equipped with ABS, when you start the engine:
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the wheels will lock up.
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the spring brakes will come on.
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the trailer emergency brakes will come on.
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the ABS indicator light on the dash should come on and then turn off.
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8.
The braking power of the spring brakes:
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is not affected by the condition of the service brakes.
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is not affected by the air pressure level.
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depends on the brakes being in adjustment.
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All of the above.
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9.
Trailers built on or after March 1, 1998 are required to be equipped with anti-lock brakes. These trailers will have:
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yellow malfunction lamps on the left side.
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yellow malfunction lamps on the right side.
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blue malfunction lamps on the right side.
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red malfunction lamps on the left side.
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10.
The use of brakes on a steep downgrade is:
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the main braking factor.
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dangerous, and should be avoided at all costs.
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much more effective than the engine braking effect.
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a supplement to the braking effect of the engine.
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