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With an “L” restriction on your Montana Commercial Driver’s License, you are not allowed to drive vehicles equipped with air brakes. Since most semi-trucks and full-size buses are equipped with air brakes, your opportunities to work in the private and public sectors will be limited. You could risk missing out on great opportunities with such transportation service providers as Jones Brothers and Mountain Line. You should have an extensive knowledge of air brake systems to increase your driving opportunities. Air brakes help you regulate your speed or come to a complete stop while transporting heavy loads. Sharp turns, adverse weather, and heavily congested traffic require you to make quick adjustments in response to driving conditions, and a firm grasp of air brake operations keeps you safe.
Our Montana MVD CDL air brake “endorsement” practice test uses an innovative study method to help you clearly understand air brake operations. Removing the “L” restriction from your CDL requires you to demonstrate your ability to drive an air brake-equipped vehicle, perform an inspection of the air brake system, and pass an official Air Brakes Knowledge Test. Using the practice test, you will receive valuable input to create a study plan to facilitate your success. You must correctly answer at least 80% of the 25 questions on the official knowledge test to receive a passing score. The practice test contains 30 multiple-choice questions, similar to those on the official knowledge test, to evaluate your current knowledge level and identify the most critical information you should study more to increase it.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
This Montana MVD CDL air brake “endorsement” practice test uses the most authoritative information available to expand your knowledge of air brakes. The practice test is based on the most recent Montana MVD CDL manual (Montana CDL Handbook 2025) and is up to date as of December 2025. If you get a question wrong, the practice test provides a thorough explanation of the correct answer, using information from the CDL manual. This approach provides you with reliable information to support your answers. The practice test is a winning strategy for eliminating your learning barriers that outperforms any traditional study method.
In comparison to the practice test, traditional study methods use an approach that is more one-dimensional and focused on your ability to memorize the answers to the questions. Traditional study methods are less effective in helping you absorb the information you must know and more likely to result in you having to wait a full day to retest. The practice test is interactive and coaches you on understanding the essential components and function of air brakes. You will have immediate access to the information you must know and learn how to apply it to various driving scenarios. The practice test provides a clear understanding of air brakes and increases your chances of passing the official knowledge test on your first attempt.
You shouldn’t feed the bears in Glacier National Park, but you can partake in developing exceptional driving skills using the practice tests at https://driving-tests.org/montana/.
Driver’s Ed is - nobody wants to set foot inside the MVD. That’s why millions of learners trust us for simple, visual, effective prep.
We are an officially recognized FMCSA Entry-Level Driver Training provider and a proud partner to over 2,500 libraries. We work with safety organizations like GHSA and the National Safety Council to help create safer roads for everyone.
Our trademarked system automatically saves questions you miss, creating personalized tests that target your weak spots until you’ve mastered the material.
Get smarter as you study. Our new AI-powered feedback provides detailed, question-level insights to help you understand the why behind each answer.
Go beyond the boring black-and-white manual. Our interactive handbook lets you read, listen with an MP3 audio version, or even chat with it to find the information you need, faster.
We build our practice questions from the current 2025 MT Driver Handbook and refine them using patterns recent test‑takers report.
Driver handbook • Knowledge‑test/permit overview • Fees & ID requirements • Office/appointment info
We mirror recurring themes (e.g., right‑of‑way traps, sign look‑alikes) and use similar distractors and wording styles.
We don’t collect or publish actual test items and we’re not affiliated with MVD.
