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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:
keep from rolling back.
prevent movement of cargo.
hold compressed air.
2. Weight that is loaded so there is a high center of gravity:
makes a vehicle easier to handle.
reduces the chance that the load will shift to the side or fall off.
causes greater chance of rollover.
3. When the spring brakes are on, you should:
not push the brake pedal down.
pump the brakes.
press the accelerator.
4. By pushing the trailer air supply control knob in, you:
shut the air off and put on the trailer emergency brakes.
supply the trailer with air.
supply the tires with air.
5. A passive railroad crossing is one that:
requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
does not have any type of traffic control device.
has a traffic control device installed at the crossing to regulate traffic.
6. The space under a heavily loaded vehicle can be very small. This can cause problems:
on dirt roads.
when crossing railroad tracks.
All of the above.
7. When meeting an oncoming vehicle at night, if the other driver does not put their low beams on, you should:
"get back at the other driver" by putting your own high beams on.
look slightly to the right to avoid looking directly at the lights of the oncoming vehicle.
slow down and look straight ahead in your lane.
8. The air brake lag distance at 55 mph on dry pavement adds about:
32 feet.
60 feet.
75 feet.
9. To use the controlled braking method in an emergency, you should:
apply the brakes as hard as you can without locking the wheels.
apply the brakes when the wheels lock up.
apply your brakes all the way, and release the brakes when the wheels lock up.
10. After starting the engine, oil pressure should rise to a normal level:
within seconds.
within 2 minutes.
within 6 minutes.
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OH CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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