- Updated for January 2025
- Based on 2025 ME commercial driver's license manual
Free Maine CDL Air Brakes Test 2025
Maine is a great state for truck drivers, with beautiful roads, not too much traffic, and a significant amount of exports that need to get out of the state to the rest of the country -- from lumber to blueberries. To make the most of your Maine CDL, you want to be able to drive vehicles with or without air brakes, so that you are not limited. This quiz is closely based on the questions in the Maine Commercial Driver License Manual with explanations that you should read closely. It is multiple-choice, just like the real air brake exam, so that you can get comfortable with this format. Practice early, often, and until you get the score that you want. Soon, you’ll be driving a vehicle with air brakes safely and proudly on the Maine roadways!
- 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 ME DMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- When should you drain your air tanks?
- Under which conditions are front wheel brakes good?
- At what measurement is the safety valve USUALLY set to open?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- Which of the following is NOT part of the air brake system?
- What is the best way to test your vehicle's low air pressure warning signal?
- Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with an anti-lock braking system (ABS)?
- Why must you pass a knowledge test on air brakes?
- How do brakes work on a long, steep downgrade?
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- Which of the following are true about a dual air brake system?
- Which vehicles must have low air pressure warning signals?
- An anti-lock braking system (ABS)
- Spring brakes are
- Which of the following is NOT part of the drum brake?
- Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
- When should you use the parking brake?
- How do you check your truck's slack adjusters?
- If the air tanks are not drained,
- Slack adjusters are
- The tractor protection valve
- After the initial drop, the maximum acceptable leakage rates per minute are
- The purpose of a supply pressure gauge is
- Which of the following can cause brakes to fade or fail?
- Which of the following should you do before leaving your vehicle unattended?
- 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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