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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 Oregon CDL knowledge test. The OR 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 Oregon CDL Manual. Take this OR CDL practice test now to prepare for the actual air brakes test!
1.
When the air system is fully-charged, the air loss rate for a single vehicle with the engine off should be less than:
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2 psi in one minute.
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4 psi in one minute.
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2 psi in 30 seconds.
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3 psi in one minute.
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2.
With brake drums, if brakes become too hot:
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the brakes will supply too much power to the drive wheels.
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The brakes may stop working
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the air compressor will kick on to cool the brakes.
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your ABS will malfunction.
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3.
Front brake limiting valves were used to:
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reduce the chance of the front wheels skidding on slippery surfaces.
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reduce exhaust emissions.
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prevent overheating of the front tires.
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reduce your speed so further braking or shifting is not required.
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4.
An anti-lock braking system (ABS):
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should help you steer around an obstacle while braking.
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helps you avoid skids caused by over braking.
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helps you avoid wheel lock up.
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All of the above.
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5.
Front wheel braking is good:
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under all conditions.
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only in good weather.
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only in wet conditions.
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Never.
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