MAINE CDL AIR BRAKES PRACTICE TEST
21.
Antifreeze:
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helps the engine under hot conditions as well as cold conditions.
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helps the engine only when the temperature is below freezing.
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helps the engine only under hot conditions.
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22.
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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2 inches
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1/2 inch
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1 inch
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23.
To control your speed on a downgrade, you should:
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use controlled braking.
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use engine braking.
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fully apply the brakes.
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24.
Before leaving your vehicle unattended, you should:
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Apply the parking brake.
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Remove the keys.
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All of the above.
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25.
Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
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20 to 45 psi.
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55 to 74 psi.
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5 to 15 psi.
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