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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. The most common foundation brakes found on vehicles with air brakes are the:
wedge brakes.
disc brakes.
S-cam brakes.
2. The air brake lag distance at 55 mph on dry pavement adds about:
60 feet.
75 feet.
32 feet.
3. An ABS system:
helps you avoid skids caused by over braking.
gives you more control over the vehicle during braking.
All of the above.
4. When you apply the brakes, the brake shoes and linings are pushed against:
the supply pressure gauge.
the S-cam.
None of the above.
5. What should you do to test your vehicle's low air pressure warning signal?
With the key in the "on" or "battery charge" position, rapidly apply and release the foot brake.
Pump the brakes until the air pressure drops below 80 psi.
With the engine running, put the vehicle in a forward gear and attempt to drive forward.
6. Front brake limiting valves were used to:
prevent overheating of the front tires.
reduce your speed so further braking or shifting is not required.
reduce the chance of the front wheels skidding on slippery surfaces.
7. Most hydraulic brake failures occur for one of two reasons, one of which is:
relying too much on the engine braking effect.
loss of hydraulic pressure.
excessive downshifting.
8. 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 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.
9. 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.
no part of the vehicle is visible in the mirror.
10. To prevent rollover, you should:
place the cargo near the rear of the trailer.
put the lightest parts of the cargo under the heaviest parts.
keep the cargo as close to the ground as possible.
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AK CDL Air Brakes Test

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