View instructions
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 Alaska CDL knowledge test. The AK 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 Alaska CDL Manual. Take this AK CDL practice test now to prepare for the actual air brakes test!
1. The tire load rating is stated:
inside the suspension system.
on the side of each tire.
on each axle.
2. In air-operated disc brakes, the pressure of the ______ on the ______ turns a "power screw".
brake camshaft; tie rod
slack adjuster; tie rod
brake chamber; slack adjuster
3. If your vehicle is hydroplaning, you should:
accelerate to get through the water as quickly as possible.
use the brakes to slow down.
release the accelerator and push in the clutch.
4. If you must drive slowly, how should you alert following drivers?
Turn on your taillights
Flash your brake lights
Use your emergency flashers if it is legal
5. If your vehicle does not have automatic air tank drains, how often should you drain air tanks to remove moisture and oil?
Every 4 hours.
At the end of each working day.
Once a week.
6. The one-way check valve:
supplies air to the trailer air tanks.
keeps your wheels from locking up when you brake hard.
keeps air from going out if the air compressor develops a leak.
7. Having ABS on only the trailer:
still gives you more control over your vehicle during braking.
is very dangerous.
makes the trailer more likely to swing out.
8. After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
shutting the engine off so you can hear the brakes.
applying and releasing the trailer brakes and listening for the sound of trailer brakes.
All of the above.
9. The trailer hand valve should:
never be used for parking.
be used in driving.
never be used to test the trailer brakes.
10. Older trailers do not have spring brakes. If the air supply leaks away:
the trailer will stop normally.
there will be no emergency brakes.
the ABS won't work properly.
Page 1 of 3
Next page

AK Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
Share This Online CDL Test
Rate this Air Brakes Test
5 out of 5
based on 250 votes