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UPGRADE TO CDL PREMIUM
1.
Before leaving your vehicle unattended, you should:
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Chock the wheels.
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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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2.
Why must air tanks be drained?
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To keep from fouling the air compressor oil.
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Water and
oil reduce the air pressure.
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The low boiling point of water reduces braking power.
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Water can freeze in cold weather and cause brake failure.
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3.
Which of the following is not part of the air brake system?
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Air compressor
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Alcohol evaporator
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Air storage tanks
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Air filter
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4.
Some air brake systems have an alcohol evaporator to:
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prevent ice from forming in the brake system.
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reduce the stopping power of the vehicle.
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reduce the danger of slipping.
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force the brake shoes away from one another.
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5.
Which of the following is NOT part of the drum brake?
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Brake drum
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Return spring
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Safety valve
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Axle
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6.
If your vehicle is equipped with air brakes, loss of air pressure in the
emergency line causes:
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the trailer emergency brakes to come on.
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the speed of your vehicle to increase.
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the trailer spring brakes to come on.
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All of the above.
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7.
The stop light switch:
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turns on the brake lights when you put on the air brakes.
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should be used to fend off tailgaters.
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warns you when the air supply pressure drops below 55 psi.
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tells you when you need to use your parking brake instead of the service brake.
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8.
When going down a steep downgrade, you should:
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use the parking brake.
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avoid braking and rely on engine braking.
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use a low gear, and a proper braking technique.
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use escape ramps whenever possible.
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9.
To check slack adjusters on S-cam brakes, you should:
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use gloves and pull hard on each slack adjuster you can reach.
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press the brake pedal and listen for any strange noises.
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check that the spring brakes come on automatically.
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All of the above.
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10.
An ABS system:
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keep your wheels from locking when you brake hard.
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gives you more control over the vehicle during braking.
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helps you avoid skids caused by over braking.
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All of the above.
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