HI CDL AIR BRAKES PRACTICE TEST
11.
With the air pressure built up to governor cutoff, the maximum leakage rates per minute after the initial pressure drop are:
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3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
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1 psi for single vehicles and 2 psi for a combination of 2 vehicles.
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5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
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12.
You are coming down a long, steep downgrade. Which of the following is a sign that your brakes may have started to fade?
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You have to apply your brakes harder and harder to get the same stopping power.
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You hear a loud "bang".
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The brake pedal feels spongy or goes to the floor.
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13.
Which of the following is NOT a reason for hydraulic brake failure?
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Stab braking
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Loss of hydraulic pressure
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Brake fade on long hills
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14.
The best way to recognize that your trailer has started to skid is:
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by seeing it in your mirrors.
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by feeling the brakes come on.
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by recognizing tire failure.
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15.
If stopped on a hill, how can you start moving without rolling back?
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Press on the gas pedal, even if you have to roll back a little.
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Release the parking brake before you have applied enough engine power to keep from rolling back.
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Partly engage the clutch before you take your right foot off the brake, put on the parking brake if necessary.
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