CDL AIR BRAKES PRACTICE TEST - NORTH CAROLINA
16.
When driving in very hot weather, the heat will increase the chances of:
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loss of hydraulic pressure.
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ABS malfunction.
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suspension system defects.
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tire failure.
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17.
What should you do to test your vehicle's low air pressure warning signal?
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Pump the brakes until the air pressure drops below 80 psi.
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Release the parking brake valve and the tractor protection valve and reduce the air pressure by stepping on and off the brake pedal.
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With the key in the "on" or "battery charge" position, rapidly apply and release the foot brake.
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With the engine running, put the vehicle in a forward gear and attempt to drive forward.
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18.
Which of the following is NOT a reason for hydraulic brake failure?
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Brake fade on long hills
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Loss of hydraulic pressure
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Stab braking
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All of the above.
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19.
When the spring brakes are on, you should:
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not push the brake pedal down.
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exceed the posted speed limit.
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press the accelerator.
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pump the brakes.
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20.
When you pull hard on a slack adjuster and it moves more than about _____ where the push rod attaches to it, the slack adjuster probably needs adjustment.
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1/2 inch
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1/4 inch
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1 inch
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2 inches
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