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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 West Virginia CDL knowledge test. The WV 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 West Virginia CDL Manual. Take this WV CDL practice test now to prepare for the actual air brakes test!
1. Air brakes:
are prohibited on larger vehicles.
are an effective way to stop large and heavy vehicles.
can improve fuel efficiency.
should be used only when driving on wet roads.
2. What factors can cause brakes to fade or fail?
Not taking your foot off the accelerator.
Overheating, low air pressure or water in the air tanks.
Going too slow.
Not pressing the brake pedal hard enough.
3. When using a fire extinguisher, you should stay:
at least 10 feet away from the fire.
as far away from the fire as possible.
at whatever distance you think is safe.
as close to the fire as possible, without getting burnt.
4. The spring brakes come on:
when you lose ABS control.
when main air pressure is lost.
when air pressure in both air brake systems rises to a value set by the manufacturer.
when you bring the vehicle to a complete stop right away.
5. Too little weight on the driving axles can cause:
mechanical damage.
poor visibility.
longer stopping distances.
poor traction.
6. When the low air pressure warning light and buzzer first come on, you should:
immediately put alcohol into the air system.
downshift and slow down.
bring the vehicle to a safe stop right away.
speed up to restore pressure.
7. Distracted driving may be caused by _________ while driving.
listening to music
maintaining constant speed
All of the above.
8. Brake lag is:
the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
the amount of air pressure required to stop the vehicle.
the time required for the air brakes to work after the brake pedal is pushed.
the distance your vehicle will travel, in ideal conditions, while you are braking.
9. The emergency brake system:
uses the parking brake to stop the vehicle in the event of a brake system failure.
uses the service brake to stop the vehicle in the event of a parking brake system failure.
uses parts of the service and parking brake systems to stop the vehicle in the event of a brake system failure.
None of the above.
10. If you are driving a 30-foot vehicle at 55 mph, you should leave at least _____ between you and the vehicle ahead.
4 seconds
5 seconds
2 seconds
3 seconds
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WV CDL Air Brakes Test

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