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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.
To prevent drowsiness you should:
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schedule trips for the middle of the night.
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never drive with a passenger.
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get adequate sleep before a trip.
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avoid exercise to save more energy.
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2.
The trailer hand valve should:
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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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be used in driving.
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All of the above.
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3.
You supply air to the trailer brake system by:
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pushing in the trailer air supply knob.
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plugging the electrical cord into the trailer.
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pulling out the trailer air supply valve.
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connecting the tractor service air line to the trailer service glad hand.
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4.
You should drain your air tanks:
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every month.
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at the end of each working day.
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at the beginning of each trip.
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at least once a week.
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5.
To make the brakes work, air brakes use:
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hydraulic air.
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nitrogen.
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compressed air.
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carbon monoxide.
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