AIR BRAKES CDL PRACTICE TEST - KANSAS
11.
The spring brakes come on:
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when air pressure in both air brake systems rises to a value set by the manufacturer.
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when main air pressure is lost.
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when you bring the vehicle to a complete stop right away.
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when you lose ABS control.
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12.
Brake lag is:
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the time required for the air brakes to work after the brake pedal is pushed.
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the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
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the amount of air pressure required to stop the vehicle.
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the distance your vehicle will travel, in ideal conditions, while you are braking.
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13.
Some air brake systems have an alcohol evaporator to:
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force the brake shoes away from one another.
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reduce the stopping power of the vehicle.
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prevent ice from forming in the brake system.
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reduce the danger of slipping.
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14.
The use of air brakes on a steep downgrade is only a supplement to:
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the use of the spring brakes.
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the use of the "controlled braking" method.
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the use of the parking brakes.
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the braking effect of the engine.
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15.
The best way to recognize that your trailer has started to skid is:
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by recognizing tire failure.
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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 opening the window and feeling the front of the mirror.
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