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Most semi-trucks and full-size buses are equipped with air brakes, making it wise to avoid having an “L” restriction on your Ohio Commercial Driver’s License (CDL). The “L” restriction restricts you from driving a vehicle equipped with air brakes and limits your access to some great driving opportunities. Air brakes provide the braking force necessary to safely navigate changing or unexpected road conditions, like heavy rain, sharp turns, and heavily congested traffic, while transporting heavy loads. Your ability to competently operate them gives you an advantage in competing for jobs with such employers as Horizon Freight Systems and Akron Metro RTA. Fortunately, there is a way to remove the air brake restriction from your CDL. However, you’ll need to secure sufficient training to get the job done.
Our Ohio BMV CDL air brake “endorsement” practice test is a user-friendly resource that helps you develop an extensive knowledge of air brakes. You must demonstrate your ability to drive an air brake-equipped vehicle, perform an inspection of the air brake system, and pass an Air Brake Knowledge Test to remove the “L” restriction. The practice test includes 30 questions, like those on the official knowledge test, to assess your skill level and direct you to the information you should study to improve. You are required to correctly answer 80% of the 25 questions to pass. The practice test is an effective and time-efficient resource to teach you about air brakes and prepare you to exhibit your expertise in using them..
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
This Ohio BMV CDL air brake “endorsement” practice test is an engaging and innovative study method that addresses your specific misunderstandings. The practice test is based on the most recent Ohio BMV CDL manual (Ohio CDL Handbook 2025) and is up to date as of December 2025. If you get a question wrong, you won’t need to do additional research because the practice test will provide a thorough explanation of the correct answer. This approach saves you valuable time and provides you with the most authoritative information available. Since the information comes directly from the CDL manual, you can be fully confident in applying it to your driving practices.
More traditional study methods are not as effective as the practice test in preparing you to meet the challenges of the official knowledge test. Traditional study methods train you to memorize the answers to the questions but offer no assistance in correcting any inaccuracies in your thinking. You are more likely to become frustrated and stalled in your learning process while using additional resources to search for the right answers. This approach deprives you of a fully developed knowledge of air brake systems. The practice test outperforms these traditional study methods by providing comprehensive instruction, boosting your confidence, and increasing your chances of passing the official knowledge test on your first attempt.
The Great American Ballpark features many acknowledgments of its history, and you can get excited about a future of excellent driving skills you’ll develop using the practice tests at https://driving-tests.org/ohio/.
Driver’s Ed is - nobody wants to set foot inside the BMV. 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 OH 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 BMV.
