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UPGRADE TO CDL PREMIUM
1.
In newer vehicles with air brakes, you put on the parking brake:
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using a diamond-shaped, yellow, push-pull control knob.
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placing the transmission in Park.
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using a P-shaped, yellow control knob.
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2.
Combination vehicles have __ air lines.
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1
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3
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2
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3.
The tractor protection valve:
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will close automatically if the air pressure drops to a certain level.
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provides the air supply for the brake system.
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All of the above.
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4.
If stopped on a hill, how can you start moving without rolling back?
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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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Press on the gas pedal, even if you have to roll back a little.
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5.
You are going down a steep grade. Once the vehicle is in the proper low gear, you should brake just hard enough to feel a slowdown, and then release the brakes when your speed has been reduced to ____ below your safe speed.
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5 mph
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10 mph
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15 mph
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6.
Vehicles with air brake systems take longer to come to a complete stop than vehicles with hydraulic brakes because of:
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reaction distance.
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brake lag.
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brake fading.
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7.
The safety relief valve is located:
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in the first tank the air compressor pumps air to.
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on each end of the vehicle's axles.
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in the front brake.
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8.
A tank endorsement is:
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required for both liquids and gases.
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only required when transporting gases.
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only required when transporting liquids.
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9.
Front-end header boards:
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protect drivers from spilled cargo.
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protect drivers from cargo in case of an accident or emergency stop.
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should never be used.
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10.
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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75 feet.
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