TX CDL AIR BRAKES PRACTICE TEST
6.
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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Going too slow.
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Not taking your foot off the accelerator.
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7.
Supply pressure gauges tell drivers:
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how much air pressure they are applying to the brakes.
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how much pressure is in the air tanks.
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how much pressure the relay valves should send to the trailer brakes.
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All of the above.
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8.
Foundation brakes are used:
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only with the right wheels.
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only with the front wheels.
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only with the rear wheels.
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at each wheel.
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9.
When driving on long and/or steep downgrades, to select an appropriate safe speed you should consider:
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the length of the grade.
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the road conditions.
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the total weight of the vehicle and cargo.
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All of the above.
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10.
Which of the following is NOT part of the air brake system?
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Service brake system
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Anti-lock brake system
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Parking brake system
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Emergency brake system
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