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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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Failure to pass the Ohio BMV CDL Air Brakes Knowledge Test or the Skills Test in an air brake-equipped vehicle results in the retention of the restriction code “L” on your license. This restriction will disqualify you from operating any vehicle equipped with air brakes. That powerful little letter shuts the door to many Commercial Motor Vehicle (CMV) positions across the Buckeye State. In Ohio, failing the air brakes test also results in a one-day waiting period and a fee before you may retest. Our Ohio CDL Air Brakes Practice Tests are designed to ensure you pass on the first attempt, strengthening your marketability and preventing delays and fees.
From the steep grades in the Appalachian foothills to the winds across the flat farmlands, professional drivers depend on air brakes. Winter snow in parts of the state, ice storms along I-75, and congestion on I-70 and I-71 through Columbus and Cincinnati are other reasons Ohio employers favor air brake-qualified drivers.
The official Air Brakes Knowledge Test covers the operation, maintenance, and safety of air brake systems and requires a minimum passing score of 80%. Our practice tests mirror the official BMV format and provide immediate feedback to help you learn faster and remember the material. Our experts have designed these practice tests to eliminate unnecessary material that is not tested but is often found in other study guides. We ensure that everything you study applies to what you may see on test day. Our practice tests also feature AI-driven feedback on each response, an interactive CDL Manual, and our state-of-the-art Challenge Bank that covers the entirety of your study needs and re-questions you for any material you miss. In fact, it re-questions you until you get the question correct, helping ensure you are absolutely prepared for the official exam. Once you’ve aced this practice test, try another from our series: https://driving-tests.org/ohio/oh-cdl-air-brake-practice-test/.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
The restriction “L” limits what you can drive, where you can work, and how far your career can go. Many drivers also choose to add valuable endorsements such as T – Doubles/Triples, N – Tank Vehicles, H – Hazardous Materials, and X – Tank and Hazmat Combined. Check out an Endorsement Practice Test to get started: https://driving-tests.org/ohio/oh-cdl-hazmat-practice-test/. Also, while you’re tackling air brakes, which nearly all combination vehicles use, why not continue your studies and prepare for the Combination Vehicles Knowledge Test (one of the requirements needed to obtain a Class A License)? Our Combination Vehicles Practice Tests are your ticket to passing: https://driving-tests.org/ohio/oh-cdl-combination-test/.
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.
