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Driving across the Heart of Dixie, you’ve no doubt learned that most big rigs and buses rely on air brakes. The Alabama DMV requires every driver of commercial motor vehicles (CMVs) equipped with air brakes to pass the official Air Brakes Knowledge Test and Skills Test. Without passing, your CDL will carry an “L” restriction, meaning you can’t drive any truck or bus equipped with air brakes. This severely limits most trucking and passenger-transport jobs in the state (including the operation of tractor-trailers and other combination vehicles, most of which are air brake-equipped. Don’t worry. Our experts have put together Air Brakes Practice Tests that filter out the unnecessary bulk of information you’d find in study guides and focus directly on what you’ll need to pass the test on your first attempt.
Chief Educational Researcher, Driving‑Tests.org (ACES member)
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Employers like FedEx, Old Dominion, Southeastern Freight Lines, and UPS rely on air-brake-qualified drivers. School systems and charter companies like Capital Trailways and Southern Coaches do as well. Major manufacturers like Honda, Hyundai, and Mercedes-Benz require air brake-equipped trucks for their logistics needs. Whether you’re hauling timber, poultry, cotton, or car parts, removing the air brakes restriction from your CDL is a must!
The official Air Brakes Knowledge Test covers service brakes, parking brakes, and emergency brakes. You’ll need to recognize how air pressure builds, how warning systems work, and how to conduct inspections to identify leaks or low-pressure conditions. The test consists of multiple-choice questions, 16 of which must be answered correctly (80%) to pass. Failing requires a mandatory wait period and a possible fee for retesting.
Our Alabama CDL Air Brakes Practice Tests mirror the DMV exam and reflect the latest state and FMCSA guidelines. Our practice tests offer feedback on each response, which helps you learn as you go, versus other resources that retain all comments until the end. Our practice tests help you recognize the exact phrasing you’ll see on test day and avoid common traps like distracting or tricky words or phrases, or double negatives often used. Once you’ve aced this one, try another practice test here: https://driving-tests.org/alabama/al-cdl-air-brake-practice-test/.
When you’re ready, schedule your exam with DMV, pay any applicable fees, and take your test. Also, check out our Alabama endorsement practice tests to add valuable marketability to your CDL. Here’s one: https://driving-tests.org/alabama/al-cdl-hazmat-practice-test/. And while you’re getting your Air Brakes restriction removed, you might consider testing for the Class A CDL, which permits you to legally operate tractor-trailers and other combination vehicles! Check out our series of Combination Vehicle Practice Tests here: https://driving-tests.org/alabama/al-cdl-combination-test/.
Driver’s Ed is - nobody wants to set foot inside the DMV. 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 AL 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 DMV.
