DISTRICT OF COLUMBIA CDL AIR BRAKES PRACTICE TEST
16.
Having ABS on only the trailer:
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still gives you more control over your vehicle during braking.
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makes the trailer more likely to swing out.
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makes the trailer more likely to roll over.
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is very dangerous.
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17.
The Johnson bar is a valve that:
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keeps air from going out if the air compressor develops a leak.
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reduces the braking pressure to a safe level.
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works the trailer brakes.
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is installed in the first tank the air compressor pumps air to.
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18.
When driving in a construction zone, if a construction worker is near the road, you should:
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speed up.
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maintain a constant speed.
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come to a complete stop.
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further reduce your speed.
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19.
Spring brakes are usually held back by:
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modulating control valves.
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the brake pedal.
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the antilock braking system.
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air pressure.
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20.
If air pressure does not build up fast enough:
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the pressure may drop too low during driving.
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you should turn the electrical power on and step on and off the brake pedal.
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you should put the parking brake on and gently pull against it in a low gear.
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you may be forced to turn off the engine and release the parking brake.
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