AIR BRAKES CDL PRACTICE TEST - MASSACHUSETTS
11.
You should drain the air tanks completely. If water and oil collect in the air tanks:
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your brakes could fail.
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your brakes could heat up.
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your brakes could become hard to press.
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None of the above.
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12.
The stop light switch:
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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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tells you when you need to use your parking brake instead of the service brake.
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warns you when the air supply pressure drops below 55 psi.
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13.
On any upgrade, gravity:
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slows you down.
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speed you up.
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doubles your speed.
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doesn't affect your speed.
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14.
The alcohol evaporator:
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shows how much air pressure you are applying to the brakes.
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helps to reduce the risk of ice in air brake valves and other parts in cold weather.
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ensures the coolant temperature gauge remains in the normal range.
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eliminates the need for daily air tank drainage.
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15.
What is an important thing to remember about emergency braking?
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Your natural response (hitting the brakes) is never the right solution.
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The more heavily loaded semitrailer trailer should be in the rear.
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Pushing down on the brake pedal as hard as you can will only keep the wheels locked up and cause a skid.
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You should never use stab braking.
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