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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. If the safety relief valve in the air brake system releases air:
this will supply more power to the brakes.
something is wrong.
this will supply more power to the drive wheels.
the valve is fully operational.
2. When coupling, you should:
make sure the sliding fifth-wheel is locked.
make sure the trailer wheels are not chocked.
make sure the trailer kingpin is bent.
be aware that wrong coupling and uncoupling can be very dangerous.
3. When you pull hard on a slack adjuster and it moves more than about _____ where the push rod attaches to it, the slack adjuster probably needs adjustment.
1 inch
1/2 inch
1/4 inch
2 inches
4. Antifreeze:
helps the engine only under hot conditions.
doesn't help the engine in any way.
helps the engine only when the temperature is below freezing.
helps the engine under hot conditions as well as cold conditions.
5. Too little weight on the driving axles can cause:
longer stopping distances.
poor traction.
mechanical damage.
poor visibility.
6. When backing, you should:
back quickly.
back and turn toward the right side whenever possible.
only use mirror on the driver's side.
use the mirrors on both sides.
7. The air compressor governor:
controls when the air storage tanks will pump air into the air compressor.
stops the compressor from pumping air.
allows the compressor to start pumping air when the tank pressure rises to the "cut-out" pressure.
All of the above.
8. Having ABS on only the trailer:
makes the trailer more likely to roll over.
is very dangerous.
still gives you more control over your vehicle during braking.
makes the trailer more likely to swing out.
9. You must take the CDL skills tests in the type of vehicle for which you wish to be licensed. If your test vehicle does not have air brakes:
you won't receive a CDL.
you will be restricted to driving vehicles without air brakes.
you'll need to take another knowledge test about air brakes.
you'll have to immediately retake your test using another vehicle.
10. If your ABS malfunctions:
you still have normal brake functions.
the parking brakes will not work.
you should immediately come to a complete stop.
the service brake will not work.
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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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