AIR BRAKES CDL PRACTICE TEST - SOUTH DAKOTA
16.
Which of the following is not a braking system on a truck?
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Steering brake
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Service brake
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Emergency brake
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Parking brake
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17.
Combination vehicles have __ air lines.
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4
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3
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1
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2
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18.
Spring brakes:
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are usually held back by air pressure.
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will apply the brakes when a leak in the air brake system causes all the air to be lost.
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will come fully on when air pressure drops to a certain range, typically 20 to 30 psi.
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All of the above.
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19.
The air brake lag distance at 55 mph on dry pavement adds about:
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32 feet.
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60 feet.
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16 feet.
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75 feet.
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20.
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 lose ABS control.
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when you bring the vehicle to a complete stop right away.
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