AIR BRAKES PRACTICE TEST - TEXAS
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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the Texas CDL knowledge test. The TX CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Texas CDL Manual. Take this TX CDL practice test now to prepare for the actual air brakes test!
1.
Most hydraulic brake failures occur for one of two reasons, one of which is:
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excessive downshifting.
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relying too much on the engine braking effect.
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loss of hydraulic pressure.
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driving in cold weather.
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2.
At 55 mph, the total stopping distance for vehicles with air brake systems traveling in ideal conditions is:
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less than 250 feet.
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over 450 feet.
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over 250 feet.
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less than 150 feet.
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3.
If your ABS malfunctions:
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you still have normal brake functions.
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the parking brakes will not work.
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you should immediately come to a complete stop.
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the service brake will not work.
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4.
The supply pressure gauges tell you how much air pressure:
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you are applying to the brakes.
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is in the air tanks.
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is in the air brakes.
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is going to the brake chambers.
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5.
Front brake limiting valves were used to:
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prevent overheating of the front tires.
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reduce the chance of the front wheels skidding on slippery surfaces.
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reduce your speed so further braking or shifting is not required.
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reduce exhaust emissions.
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