CDL AIR BRAKES PRACTICE TEST - WEST VIRGINIA
11.
To operate a vehicle equipped with air brakes, you must pass the air brakes knowledge test. Why?
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If you don't, you will only receive a CDL permit.
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If you don't pass the air brakes test, you can't get a CDL.
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All trucks have air brakes.
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If you don't pass the air brakes test, you will be restricted to driving vehicles without air brakes.
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12.
The best way to know what's going on behind and to the sides of your vehicle is to:
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check your mirrors regularly.
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use the rear view camera.
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ask your passenger(s).
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lean out of the window.
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13.
Slack adjusters:
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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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are used to adjust the brakes on an air-brake system.
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All of the above.
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14.
An ABS system:
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keep your wheels from locking when you brake hard.
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gives you more control over the vehicle during braking.
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helps you avoid skids caused by over braking.
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All of the above.
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15.
What should you do to test your vehicle's low air pressure warning signal?
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Release the parking brake valve and the tractor protection valve and reduce the air pressure by stepping on and off the brake pedal.
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With the engine running, put the vehicle in a forward gear and attempt to drive forward.
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Pump the brakes until the air pressure drops below 80 psi.
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With the key in the "on" or "battery charge" position, rapidly apply and release the foot brake.
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