HI CDL AIR BRAKES PRACTICE TEST
6.
Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
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55 to 74 psi.
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5 to 15 psi.
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20 to 45 psi.
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7.
During a trip you should check:
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pressure gauges.
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temperature gauges.
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All of the above.
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8.
The heavier the vehicle:
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the more work the brakes must do to stop it.
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the less work the brakes must do to stop it.
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the higher the center of gravity will be.
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9.
Which of the following is NOT correct? An ABS system:
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helps you stop faster.
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is a safety anti-skid braking system.
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helps you avoid wheel lock up.
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10.
The most common type of brake is the:
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S-cam drum brake
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G-cam disc brake
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R-cam drum brake
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