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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 Wyoming CDL knowledge test. The WY 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 Wyoming CDL Manual. Take this WY CDL practice test now to prepare for the actual air brakes test!
1. To test the air leakage rate, with a fully-charged air system you should ____________ and time the air pressure drop.
turn off the engine, release the parking brake
put alcohol into the air system, run the engine at a fast idle
check the air compressor's drive belt, chock the wheels
release the parking brake, leave the engine running
2. Why must air tanks be drained?
To keep from fouling the air compressor oil.
Water and oil reduce the air pressure.
The low boiling point of water reduces braking power.
Water can freeze in cold weather and cause brake failure.
3. When a tire fails, you must:
hold the steering wheel firmly.
get out and check all the tires after you have come to a stop.
stay off the brake.
All of the above.
4. Your mirrors should be adjusted so that:
a part of the vehicle is visible in the mirror.
the rear of the vehicle is visible in the mirror.
more than half of the mirror shows the vehicle.
no part of the vehicle is visible in the mirror.
5. To test the service brake:
push the brake pedal firmly while going about 5 mph.
gently try to pull forward with the trailer parking brake on, then release the brake.
push the brake pedal firmly while slowly moving backward.
shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
6. The best way to know what's going on behind and to the sides of your vehicle is to:
ask your passenger(s).
lean out of the window.
check your mirrors regularly.
use the rear view camera.
7. Typically an air system is fully-charged at:
250 psi
25 psi
75 psi
125 psi
8. It may not be safe to operate at legal maximum weights:
on two-way streets.
in hot weather.
during bad weather or in mountains.
on highways.
9. Weight that is loaded so there is a high center of gravity:
causes greater chance of rollover.
makes a vehicle easier to handle.
reduces the chance that the load will shift to the side or fall off.
All of the above.
10. The safety valve is usually set to open at:
150 psi.
200 psi.
75 psi.
100 psi.
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WY CDL Air Brakes Test

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