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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. Some air brake systems have an alcohol evaporator to:
reduce the danger of slipping.
prevent ice from forming in the brake system.
reduce the stopping power of the vehicle.
2. The braking power of the spring brakes:
is not affected by the condition of the service brakes.
is not affected by the air pressure level.
depends on the brakes being in adjustment.
3. The most common type of brake is the:
G-cam disc brake
R-cam drum brake
S-cam drum brake
4. Supply pressure gauges tell drivers:
how much pressure is in the air tanks.
how much air pressure they are applying to the brakes.
All of the above.
5. If are being followed closely, you should:
increase your following distance.
change lanes quickly.
decrease your following distance.
6. Which of the following is TRUE about dual air brake systems?
Each brake system has its own air tanks, hoses and lines.
most heavy-duty vehicles use dual air brake systems.
All of the above.
7. How do you test hydraulic brakes for leaks?
Pump the brake pedal three times, then apply firm pressure to the pedal and hold for five seconds. The pedal should not move.
Pump the brake pedal ten times and see if it holds.
Pull forward against parking brake to make sure the hydraulic brakes holds.
8. The space under a heavily loaded vehicle can be very small. This can cause problems:
when crossing railroad tracks.
on dirt roads.
All of the above.
9. Passive railroad crossings:
should never be crossed using a CMV.
do not have traffic control devices.
have at least one traffic control device.
10. The supply pressure gauges tell you how much air pressure:
is going to the brake chambers.
is in the air tanks.
you are applying to the brakes.
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AK Air Brakes CDL Test

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