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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. A passive railroad crossing is one that:
requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
has a traffic control device installed at the crossing to regulate traffic.
does not have any type of traffic control device.
2. Tar in the road pavement rising to the road surface in very hot weather:
is very sticky and will slow down your vehicle.
causes the road to become very slippery.
does not affect the road surface or driving conditions.
3. Vehicles with air brakes require more stopping distance than vehicles with hydraulic brakes. Why?
It takes one half second or more for the air to flow through the lines to the brakes.
Stopping distance for vehicles with air brakes is made up of six different factors.
Air brakes use different brake drums.
4. In newer vehicles with air brakes, you put on the parking brake:
placing the transmission in Park.
using a P-shaped, yellow control knob.
using a diamond-shaped, yellow, push-pull control knob.
5. When the air system is fully-charged, the air loss rate for a single vehicle with the engine off should be less than:
2 psi in 30 seconds.
3 psi in one minute.
2 psi in one minute.
6. The heavier the vehicle:
the more work the brakes must do to stop it.
the higher the center of gravity will be.
the less work the brakes must do to stop it.
7. Why must air tanks be drained?
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.
8. Air tanks must be drained completely to:
pump water and compressor oil into the tanks.
remove all the air.
remove all moisture and oil.
9. Why should you check your mirrors regularly to know where other vehicles are around you?
To know whether you can make a quick lane change in an emergency.
To flash the brake lights if you are being tailgated.
To move out of their way if they want to get past.
10. Air brakes are 3 different braking systems: service brake, parking brake, and _______ brake.
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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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