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View All Plans- Updated for March 2025
- Based on 2025 ME commercial driver's license manual
Free Maine CDL Air Brakes Test 2025
Our Maine DMV CDL Air Brakes Practice Tests are your key to passing your knowledge exam on the first attempt. Failure to pass the Maine DMV CDL Air Brakes Knowledge Test means that your CDL will include the restriction “L,” prohibiting you from operating commercial motor vehicles (CMVs) with air brakes. Failing the test in Maine also results in a one-day waiting period and a fee should you decide to retake the test. This “L” restriction significantly damages your job prospects in this market.
Because most semi-trucks, tractor-trailers, and commercial buses rely on air brakes for safe navigation, removing the air brake restriction from your CDL is vital for expanded job opportunities.
The steep grades and winding roads in the mountains, the narrow and uneven roads in the coastal areas, and the unpaved roads and logging trails in the rural forest areas require powerful, reliable braking systems and air brake-qualified drivers. Winter ice and snow compound these hazards, making reliable braking even more important. The major transportation routes include I-95 (a north-south corridor linking Portland, Bangor, and the Canadian border), US-1 (a coastal route), and US-11 (a critical route for logging and forestry).
The Pine Tree State demands air brakes in key industries, including forestry, fishing, paper manufacturing, and tourism. Companies requiring air brake-qualified drivers include Hartt Transportation Systems (Bangor) and Pottle’s Transportation (Hermon) in the trucking industry, and Cyr Bus Line (Old Town) and Custom Coach and Limousine (Portland) in the charter bus sector. In the logging and forestry industry, Treeline Incorporated (Lincoln), Babineau Logging Inc. (West Enfield), and Chopper One, Inc. (Eagle Lake) requires air brake-qualified drivers. The fishing and lobster transport industry includes Ready Seafood (supplying food worldwide), P.J. Merrill Seafood (Portland), and Graffam Bros. Seafood (distributing nationally). Additionally, Maine’s school districts use air brakes on their full-size buses, employing hundreds of air brake-qualified drivers.
The written Air Brakes knowledge test features multiple-choice questions based on the state’s CDL manual (Maine CDL Handbook 2025) and requires a minimum passing score of 80%. Our CDL Air Brakes Practice Tests cover everything needed for the official DMV Air Brakes Knowledge Test and also help you prepare for your skills test.
Our tests mimic the official knowledge test, and the instant feedback received on all responses helps you learn faster and ensures you pass the knowledge test!
- 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
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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Explore our rigorous, multi-tiered verification process that ensures each question mirrors the official manual for unparalleled accuracy.
At Driving-Tests.org, we understand the importance of reliable and accurate practice tests to help you prepare for your DMV exam. That's why we've developed a meticulous process to create and continually update our practice questions, ensuring they reflect the most current driving laws and regulations.
Here's an inside look at how we maintain the highest quality in our practice tests.
Content Creation and Verification Process
- 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:
Once Steven has finalized a set of questions, our team conducts a joint review session. This second level of scrutiny involves content accuracy, proofreading, and fact-checking to eliminate any errors. - User Feedback Mechanism:
After a question goes live on our site, we keep the lines of communication open. Each question features a feedback button, inviting users to report any issues or errors. This continuous feedback loop allows us to address and rectify any concerns promptly. - Responsive Updates:
In line with our commitment to accuracy, we quickly update our practice questions to reflect any changes in the DMV manuals. Additionally, we update the free electronic copy of the state's driver's license manuals on our site, typically within a few days after the DMV publishes them.
Our thorough quality control process ensures that you have access to practice tests that are as accurate and up-to-date as possible. We believe in the power of well-prepared drivers and are dedicated to providing you with the best study tools to help you succeed on your DMV exam.
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