- Updated for January 2025
- Based on 2025 AK commercial driver's license manual
Free Alaska CDL Air Brakes Test 2025
Your knowledge of air brakes will be tested to allow you to work toward getting a license without the “L” restriction in Alaska and to help you become a safer driver today.
We have included 30 multiple-choice questions carefully written based on the Alaska Commercial Driver License Manual and applicable Alaska laws. Each question includes a hint and an explanation. It is recommended that you carefully read each question’s explanation to gain some further insight into the topic to prepare for different questions on the real CDL air brake exam.
Good luck and drive safe!
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual AK DMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- How would you check your truck's slack adjusters?
- At what measurement is the safety valve USUALLY set to open?
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- How do brakes work on a long, steep downgrade?
- Slack adjusters are
- Spring brakes are
- After the initial drop, the maximum acceptable leakage rates per minute are
- The purpose of a supply pressure gauge is
- The tractor protection valve
- What is the best way to test if your vehicle's spring brakes come on automatically?
- What is the best way to test your vehicle's low air pressure warning signal?
- When should you drain your air tanks?
- When should you use the parking brake?
- Under which conditions are front wheel brakes good to use?
- An antilock braking system (ABS)
- Which of the following can cause brakes to fade or fail?
- If the air tanks are not drained,
- Which of the following is NOT part of the air brake system?
- Which of the following is NOT part of the braking process when you're driving a tractor-trailer combination vehicle with an antilock braking system (ABS)?
- Which of the following is NOT part of the drum brake?
- Which of the following are true about a dual air brake system?
- Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
- Which of the following should you do before leaving your vehicle unattended?
- Which vehicles must have low air pressure warning signals?
- Why must you pass a knowledge test on air brakes?
- The low air pressure warning signal will come on before the pressure in the air tanks falls below
- A low pressure warning signal is required on
- All vehicles equipped with air brakes have
- With air brake-equipped vehicles, the parking brakes should be used
- The use of air brakes on a downgrade is only a supplement to the
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Here's an inside look at how we maintain the highest quality in our practice tests.
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- Alignment with Official Manuals:
Every question we develop is based on the most recent version of each state's official driving manual. Our team regularly monitors each state DMV's website for the latest updates to ensure our practice tests are always aligned with the most current information. - Community Feedback Integration:
We leverage feedback from our vast community of users to understand which topics are most frequently tested. This helps us focus on the areas that are most relevant and beneficial for your preparation. - Expert Content Creation:
Our in-house editor, Steven, who has extensive experience in driver education, crafts each question with precision. He conducts a thorough review of each question against the official manuals to ensure accuracy. - Rigorous Review Process:
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