AIR BRAKES CDL PRACTICE TEST - SOUTH CAROLINA
11.
When you make a quick lane change, the crack-the-whip effect can:
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the trailer to swing wide to the left.
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improve your traction.
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turn the trailer over.
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make it harder to turn without skidding.
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12.
If the drive wheels begin to spin when accelerating, you should:
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take your foot off the accelerator.
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brake gently.
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continue to accelerate.
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set the parking brake.
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13.
ABS brakes help you:
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downshift before starting down a hill.
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lock up the wheels in an emergency stop.
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find an escape route when the service brakes fail.
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avoid wheel lock up.
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14.
To check that spring brakes come on automatically, the first thing to do is to:
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turn off the engine, release the parking brake and time the air pressure drop.
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release the parking brake, move the vehicle forward slowly, and apply the brakes firmly.
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continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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All of the above.
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15.
With the controlled braking method, you:
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push down on the brake pedal as hard as you can so that the wheels the lock up.
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apply the brakes all the way and release brakes when the wheels the lock up.
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apply the brakes as hard as you can without locking the wheels.
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None of the above.
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