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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 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. If you are being tailgated, you should:
increase your following distance.
move to the left lane.
speed up.
2. At passive railroad crossings, even if there are active railroad signals that indicate the tracks are clear, you must _________  to be sure it is safe to proceed.
stop, look, and listen
go, stop and listen
listen, look and stop
3. When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
When you are conducting your pre-trip inspection.
Only while you are taking a rest break.
4. Before starting down a hill, you should slow down and shift down:
so you can coast downhill.
to a gear that will cause your engine to exceed its redline.
to a speed that you can control without using the brakes hard.
5. With brake drums, if brakes become too hot:
the brakes may stop working.
your ABS will malfunction.
the brakes will supply too much power to the drive wheels.
6. The safety valve installed in the first tank the air compressor pumps air is set to open:
if there is too little pressure.
at 30 psi.
if there is too much pressure.
7. If your trucks has a high center of gravity, which of the following is true for curves?
You should travel at the posted speed limit.
You should slow down, as your truck can roll over at the posted speed limit for the curve.
Reduce your speed to a crawl.
8. The air compressor is connected to:
the radiator.
the engine.
the transmission.
9. Why must air tanks be drained?
To keep from fouling the air compressor oil.
Water can freeze in cold weather and cause brake failure.
Water and oil reduce the air pressure.
10. If you get stuck on railroad tracks, you should:
stay in the vehicle and call for help.
have a helper push your vehicle.
get out of the vehicle and away from the tracks.
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AK CDL Air Brakes Test

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