AIR BRAKES CDL PRACTICE TEST - DELAWARE
21.
Which of the following is TRUE about dual air brake systems?
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most heavy-duty vehicles use dual air brake systems.
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Each brake system has its own air tanks, hoses and lines.
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A dual air brake system has 2 separate air brake systems.
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All of the above.
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22.
The parking brake:
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should be used whenever you park.
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should be used when you need to apply the brakes firmly.
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should be used when driving in bad weather.
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All of the above.
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23.
If your trailer starts to skid, you should:
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release the brakes to get traction back.
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accelerate slightly.
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keep the rear of your vehicle close to the curb.
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use the trailer hand brake (if you have one) to straighten out the rig.
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24.
Emergency brakes must be held on by:
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mechanical force.
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dynamic pressure.
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air pressure.
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hydraulic pressure.
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25.
What factors can cause brakes to fade or fail?
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Overheating, low air pressure or water in the air tanks.
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Not pressing the brake pedal hard enough.
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Not taking your foot off the accelerator.
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Going too slow.
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