CDL AIR BRAKES PRACTICE TEST - MASSACHUSETTS
6.
With a fully-charged air system, the leakage rates should be less than:
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2 psi for single vehicles and 3 psi for a combination of two vehicles.
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5 psi for single vehicles and 4 psi for a combination of two vehicles.
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3 psi for single vehicles and 4 psi for a combination of two vehicles.
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5 psi for single vehicles and 10 psi for a combination of two vehicles.
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7.
The low air pressure warning light is usually:
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red.
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orange.
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blue.
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yellow.
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8.
Front-end header boards:
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protect drivers from spilled cargo.
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reduce traction.
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should never be used.
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protect drivers from cargo in case of an accident or emergency stop.
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9.
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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1/4 inch
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2 inches
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1 inch
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1/2 inch
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10.
To test the low pressure warning signal, you should:
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check the air hoses connected to the brake chambers to make sure they aren't cut.
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shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal until the low air pressure warning signal comes on.
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manually let the air out of your brakes and see if the signal comes on.
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pump the brakes while your vehicle is running.
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