CO CDL AIR BRAKES PRACTICE TEST
6.
Slack adjusters:
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are used to adjust the brakes on an air-brake system.
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are the linkage between the operating rod in the brake chamber and drum brakes or disk brakes in an air brake system.
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regulate the distance that the air brake has to travel to apply friction to the wheel.
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All of the above.
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7.
Most hydraulic brake failures occur for one of two reasons, one of which is:
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driving in cold weather.
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relying too much on the engine braking effect.
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excessive downshifting.
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loss of hydraulic pressure.
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8.
As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
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a mechanical vibration.
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a thumping sound.
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air escaping from the open valve.
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the service line valve close.
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9.
Air pressure should build up in a single air system, within about:
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10 minutes.
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15 minutes.
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1 minute.
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3 minutes.
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10.
An ABS system:
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helps you avoid skids caused by over braking.
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gives you more control over the vehicle during braking.
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keep your wheels from locking when you brake hard.
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All of the above.
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