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Free Maine CDL Air Brakes Test 2025
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Based on 2025 ME commercial driver's license manual
- Triple-checked for accuracy
- Updated for March 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!
9 min to complete
Available in EN and ES
Ensuring the accuracy and quality of our program is paramount. Learn more about our rigorous standards in our Commitment to Accuracy article. 
Verified by Steven Litvintchouk,
Chief Educational Researcher, Member of ACES.
Chief Educational Researcher, Member of ACES.
Pass the first time,
guaranteed with Premium
guaranteed with Premium
What to expect on the actual ME DMV exam
25
questions
20
correct answers to pass
80%
passing score
More ME DMV Written Exam Resources
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