AIR BRAKES PRACTICE TEST - OKLAHOMA
11.
How can you tell if your vehicle is equipped with ABS?
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Trailers will have yellow ABS malfunction lamps on the left side.
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Look for yellow ABS malfunction lamps on the instrument panel.
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All of the above.
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12.
Why must air tanks be drained?
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The water can freeze in cold weather and cause brake failure.
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There might not be enough antifreeze in the system.
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The alcohol evaporator might stop working.
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13.
The trailer hand valve should:
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be used in driving.
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never be used to test the trailer brakes.
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never be used for parking.
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14.
When should you downshift automatic transmissions?
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When going down steep grades.
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When you start to get drowsy.
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Watch your tachometer, and downshift when your engine reaches the top of the range.
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15.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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20 to 45 psi
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10 to 20 psi
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100 to 120 psi
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