AIR BRAKES CDL PRACTICE TEST - SOUTH DAKOTA
6.
If your tires are hot, you should NOT:
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let air out of the tires so the pressure goes back to normal.
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drive until you correct the cause of the overheating.
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once the tires have cooled down, make another stop to check the tires.
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stop to let the tires cool down.
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7.
When backing a trailer, you should:
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turn the steering wheel in the direction you want to go.
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avoid correcting the drift.
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never make pull-ups to reposition your vehicle.
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try to position your vehicle so you can back in a straight line.
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8.
The stop light switch:
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warns you when the air supply pressure drops below 55 psi.
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tells you when you need to use your parking brake instead of the service brake.
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should be used to fend off tailgaters.
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turns on the brake lights when you put on the air brakes.
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9.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
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reduce the chance of the front wheels skidding.
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prevent movement of cargo.
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keep from rolling back.
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hold compressed air.
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10.
Brake lag is:
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the time required for the air brakes to work after the brake pedal is pushed.
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the distance your vehicle will travel, in ideal conditions, while you are braking.
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the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
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the amount of air pressure required to stop the vehicle.
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