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It's a practice test that's automatically made up of all your missed questions. Once you finish this test, you’ll be able to revisit your Challenge Bank™ to practice and sharpen your skills.
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View All Plans| 90-100 | => | 11% |
| 80-89 | => | 11% |
| 70-79 | => | 11% |
| 60-69 | => | 44% |
| <60% | => | 22% |
Since most semi-trucks, tractor-trailers, and full-size buses are equipped with air brakes, you should avoid having the “L” restriction on your Michigan Commercial Driver’s License (CDL). The “L” restriction disqualifies you from operating vehicles with air brakes, thus limiting your driving opportunities. Your ability to operate air brakes will preserve your safety by providing enough braking force to regulate your speed while transporting large amounts of weight. Air brakes make it possible to navigate changing road conditions, such as sharp turns and stalled traffic, and your ability to operate them is important to potential employers. The Great Lakes State is a great place for air brake-qualified drivers to enjoy the maximum benefits of a CDL, but it is important to be trained by a competent source.
Our Michigan SOS CDL air brake “endorsement” practice test provides an interactive learning experience to give you an extensive knowledge of air brakes. You will be required to pass an official knowledge test and a skills test (including performing an inspection of the air brakes) to remove the “L” restriction. You must answer at least 80% of the 25 questions on the official knowledge test to earn a passing score. The practice test helps you to develop a study plan that expedites the learning process. Using the practice test, you will be presented with 30 questions that will evaluate your current knowledge level and identify the information you must study to increase it.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
This Michigan SOS CDL air brake “endorsement” practice test is vastly different from any traditional study method. With traditional study methods, you are limited to learning surface knowledge through an approach that exercises your ability to memorize the answers to the questions. Traditional study methods deprive you of learning detailed information and assessing your ability to apply it. The questions from the practice test challenge you to demonstrate your comprehension of air brake systems. If you get a question wrong, the practice test gives you a detailed explanation of the correct answer. This information is taken directly from the most recent Michigan SOS CDL manual (Michigan CDL Handbook 2025) and is up to date as of December 2025.The interactive component of the practice test gives you the advantage of gaining immediate access to the information you must better understand. You can be confident in using this information to correct your misunderstandings because it comes from the most authoritative source. The practice test is the most complete study resource available to teach you about air brake operations, boost your confidence, and increase your chances of passing the official knowledge test on your first try.
Henry Ford used his engineering expertise to revolutionize the transportation industry, and you can transform your driving skills with the practice tests at https://driving-tests.org/michigan/.
Driver’s Ed is - nobody wants to set foot inside the SOS. 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 MI 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 SOS.
