AIR BRAKES CDL PRACTICE TEST - ILLINOIS
16.
How do you check that spring brakes come on automatically?
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On a tractor-trailer combination vehicle, continue to step on and off the brake pedal until the tractor protection valve and the parking brake valve close.
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On single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.
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Continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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All of the above.
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17.
To prevent rollover, you should:
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place the cargo near the rear of the trailer.
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place the cargo near the front of the trailer.
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put the lightest parts of the cargo under the heaviest parts.
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keep the cargo as close to the ground as possible.
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18.
It may not be safe to operate at legal maximum weights:
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on highways.
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on two-way streets.
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during bad weather or in mountains.
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in hot weather.
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19.
On any upgrade, gravity:
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slows you down.
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speed you up.
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doubles your speed.
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doesn't affect your speed.
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20.
When should you be particularly careful about high winds?
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When going downhill
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When driving at night
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When driving in winter
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When emerging from a tunnel
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