NORTH DAKOTA CDL AIR BRAKES PRACTICE TEST
11.
ABS:
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helps you stop faster.
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improves your visibility at night.
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may cause your wheels to lock when you break hard.
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helps you avoid skids caused by over braking.
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12.
The tractor protection valve:
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provides the air supply for the brake system.
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will close automatically if the air pressure drops to a certain level.
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will close if you apply the parking brakes.
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All of the above.
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13.
When the spring brakes are on, you should push the brake pedal down:
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Only when approaching railroad-highway crossings.
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Never.
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Only when driving uphill.
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Only when driving downhill.
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14.
Trailers built on or after March 1, 1998 are required to be equipped with anti-lock brakes. These trailers will have:
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red malfunction lamps on the left side.
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blue malfunction lamps on the right side.
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yellow malfunction lamps on the right side.
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yellow malfunction lamps on the left side.
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15.
On any upgrade, gravity:
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doesn't affect your speed.
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doubles your speed.
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slows you down.
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speed you up.
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