OR CDL AIR BRAKES PRACTICE TEST
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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!
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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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6.
Your truck has a dual air system. If either system is very low on pressure:
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either the front or the rear brake will not be fully operational.
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the ABS will not work properly.
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the tractor protection valve will not work properly.
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the low pressure warning signal will stop working.
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7.
If you are feeling sleepy, you should:
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get some coffee.
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slow down.
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drive faster.
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pull off the road and rest.
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8.
Most heavy duty vehicles use ___ air brake systems for safety.
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reduced
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single
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dual
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triple
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9.
Which of the following is NOT part of the air brake system?
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Anti-lock brake system
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Service brake system
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Parking brake system
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Emergency brake system
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10.
When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
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the rear trailer of a triple.
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strong wind.
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worn tire tread.
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rearward amplification.
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OR CDL Air Brakes Test
| Number of questions: | 25 |
| Correct answers to pass: | 20 |
| Passing score: | 80% |
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