DE CDL AIR BRAKES PRACTICE TEST
11.
When you release the brake pedal, the _____ rotates back and a spring pulls the brake shoes away from the drum.
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pressure gauge
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hydraulic brake system
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S-cam
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air compressor belt
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12.
If a load is placed on one side of the trailer:
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your brakes won't work.
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the steering axle weight will be too light to steer safely.
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making turns may be easier.
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a rollover is more likely.
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13.
When should you downshift automatic transmissions?
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Watch your tachometer, and downshift when your engine reaches the top of the range.
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When you start to get drowsy.
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When you want to go faster.
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When going down steep grades.
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14.
When you apply the brakes, the brake shoes and linings are pushed against:
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the safety relief valve.
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the supply pressure gauge.
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the S-cam.
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None of the above.
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15.
In a vehicle with a dual air brake system:
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one system supplies air to the trailer.
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each system has its own air tanks.
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both systems typically operate the regular brakes on the rear axle.
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All of the above.
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