AIR BRAKES PRACTICE TEST - DISTRICT OF COLUMBIA
11.
What is an important thing to remember about emergency braking?
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You should never use stab braking.
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The more heavily loaded semitrailer trailer should be in the rear.
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Your natural response (hitting the brakes) is never the right solution.
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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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12.
Some air brake systems have an alcohol evaporator. Checking the alcohol container and filling it up as necessary:
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helps keep the engine cool, as well as lubricating it.
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helps you avoid wheel lock up.
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reduces the risk of having an accident due to drowsy driving.
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reduces the risk of ice in air brake valves during cold weather.
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13.
Antilock brakes:
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let you drive faster.
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help you stop faster.
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decrease your stopping distance.
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None of the above.
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14.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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shutting the engine off so you can hear the brakes.
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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checking the air brake system pressure gauge for signs of major air loss.
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All of the above.
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15.
The tractor protection valve:
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will close if you apply the parking brakes.
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will close automatically if the air pressure drops to a certain level.
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provides the air supply for the brake system.
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All of the above.
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