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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 Ohio CDL knowledge test. The OH 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 Ohio CDL Manual. Take this OH CDL practice test now to prepare for the actual air brakes test!
1.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
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keep from rolling back.
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prevent movement of cargo.
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hold compressed air.
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2.
Weight that is loaded so there is a high center of gravity:
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makes a vehicle easier to handle.
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reduces the chance that the load will shift to the side or fall off.
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causes greater chance of rollover.
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3.
When the spring brakes are on, you should:
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not push the brake pedal down.
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pump the brakes.
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press the accelerator.
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4.
By pushing the trailer air supply control knob in, you:
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shut the air off and put on the trailer emergency brakes.
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supply the trailer with air.
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supply the tires with air.
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5.
A passive railroad crossing is one that:
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requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
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does not have any type of traffic control device.
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has a traffic control device installed at the crossing to regulate traffic.
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