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UPGRADE TO CDL PREMIUM
1.
The space under a heavily loaded vehicle can be very small. This can cause problems:
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on dirt roads.
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when crossing railroad tracks.
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All of the above.
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2.
Some air brake systems have an alcohol evaporator. Checking the alcohol container and filling it up as necessary:
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reduces the risk of ice in air brake valves during cold weather.
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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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3.
If the drive wheels begin to spin when accelerating, you should:
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continue to accelerate.
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brake gently.
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take your foot off the accelerator.
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4.
An alcohol evaporator:
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is used to reduce the risk of ice in air brake valves and other parts during cold weather.
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protects the air brake system from too much pressure.
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used to reduce the chance of the front wheels skidding.
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5.
You must take the CDL skills tests in the type of vehicle for which you wish to be licensed. If your test vehicle does not have air brakes:
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you'll need to take another knowledge test about air brakes.
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you'll have to immediately retake your test using another vehicle.
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you will be restricted to driving vehicles without air brakes.
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6.
Why must air tanks be drained?
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Water can freeze in cold weather and cause brake failure.
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Water and
oil reduce the air pressure.
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To keep from fouling the air compressor oil.
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7.
ABS:
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allows you to brake harder.
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should only be used on dry roads.
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is an addition to your normal brakes.
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8.
During a trip you should check:
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pressure gauges.
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temperature gauges.
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All of the above.
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9.
Older trailers do not have spring brakes. If the air supply leaks away:
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the ABS won't work properly.
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there will be no emergency brakes.
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the trailer will stop normally.
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10.
If a vehicle is equipped with ABS, when you start the engine:
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the ABS indicator light on the dash should come on and then turn off.
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the spring brakes will come on.
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the wheels will lock up.
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