AIR BRAKES CDL PRACTICE TEST - WISCONSIN
6.
How do you check that spring brakes come on automatically?
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Continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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On single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.
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On a tractor-trailer combination vehicle, continue to step on and off the brake pedal until the tractor protection valve and the parking brake valve close.
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All of the above.
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7.
With the controlled braking method, you:
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push down on the brake pedal as hard as you can so that the wheels the lock up.
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apply the brakes as hard as you can without locking the wheels.
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apply the brakes all the way and release brakes when the wheels the lock up.
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None of the above.
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8.
Which of the following is NOT correct? An ABS system:
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is a safety anti-skid braking system.
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helps you stop faster.
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helps you avoid wheel lock up.
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reduces the braking pressure to a safe level.
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9.
If your vehicle has an alcohol evaporator, every day during cold weather, you should:
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ensure that compressed air usually has some water and some compressor oil in it.
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fill it up with oil to prevent alcohol from freezing.
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fill it up with oil to prevent the pipes from freezing.
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check the alcohol container and fill up as necessary.
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10.
If air doesn't flow all the way to the back:
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your lower fifth wheel may fall off.
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a rollover is more likely.
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your brakes will not work properly.
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the trailer will tend to swing around.
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