CDL AIR BRAKES PRACTICE TEST - SOUTH DAKOTA
11.
If the drive wheels begin to spin when accelerating, you should:
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brake gently.
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set the parking brake.
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take your foot off the accelerator.
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continue to accelerate.
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12.
The best way to recognize that your trailer has started to skid is:
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by feeling the brakes come on.
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by opening the window and feeling the front of the mirror.
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by seeing it in your mirrors.
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by recognizing tire failure.
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13.
How do you check that spring brakes come on automatically?
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On single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.
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On a tractor-trailer combination vehicle, continue to step on and off the brake pedal until the tractor protection valve and the parking brake valve close.
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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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14.
If your vehicle has an alcohol evaporator, every day during cold weather, you should:
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ensure that compressed air usually has some water and some compressor oil in it.
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fill it up with oil to prevent alcohol from freezing.
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check the alcohol container and fill up as necessary.
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fill it up with oil to prevent the pipes from freezing.
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15.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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50 psi
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35 psi
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150 psi
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100 psi
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