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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. Before starting down a hill, you should slow down and shift down:
to a gear that will cause your engine to exceed its redline.
to a gear that will cause your brakes to overheat.
to a speed that you can control without using the brakes hard.
so you can coast downhill.
2. Which of the following can cause brakes to fade or fail?
Not relying on the engine braking effect
Excessive use of the service brakes
Brakes out of adjustment
All of the above.
3. Why must air tanks be drained?
Your transmission fluid may drain out.
There might not be enough antifreeze in the system.
The alcohol evaporator might stop working.
The water can freeze in cold weather and cause brake failure.
4. The safety valve is usually set to open at:
125 psi
150 psi
100 psi
200 psi
5. To apply the parking brakes:
place the parking brake control knob in Neutral.
pull the parking brake control knob out.
push the brake pedal three times.
push the parking brake control knob in.
6. What factors can cause brakes to fade or fail?
Overheating, low air pressure or water in the air tanks.
Going too slow.
Not taking your foot off the accelerator.
Not pressing the brake pedal hard enough.
7. Rough acceleration:
improves gas mileage.
can cause mechanical damage.
is necessary to warm up the engine.
is recommended during long trips.
8. In a vehicle with a dual air brake system:
one system supplies air to the trailer.
each system has its own air tanks.
both systems typically operate the regular brakes on the rear axle.
All of the above.
9. Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
less; less
less; more
greater; more
greater; less
10. Which of the following is NOT a reason for hydraulic brake failure?
Brake fade on long hills
Loss of hydraulic pressure
Stab braking
All of the above.
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WY Air Brakes Test

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