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Semi-trucks, tractor-trailers, and full-size buses are equipped with air brake systems to provide the force needed to stop while transporting significant amounts of weight. The Yellowhammer State requires drivers operating vehicles equipped with air brakes to exhibit the knowledge and skills necessary to understand the inner workings of their components and how to safely use them. Unless restrictions on using air brakes are removed from your Alabama Commercial Driver’s License (CDL), your driving opportunities will be limited. A thorough knowledge of the air brake system is essential to keeping you, your passengers, and fellow motorists safe. Therefore, it is crucial to receive comprehensive training on these systems and how to operate them.
Our Alabama DMV CDL air brake “endorsement” practice test provides expertly designed instruction that you can rely on to prepare for the official knowledge test. While you will also be required to physically inspect and identify the parts of an air brake system, you must correctly answer at least 80% of the 25 questions on the official Air Brakes knowledge test to pass. The practice test provides an initial assessment of your proficiency level using 30 questions similar to the ones on the official knowledge test. You will get a clear picture of the information you must better understand to achieve the required score. The practice test gives you the blueprint that leads you to success. You will possess the skills and confidence to pass the official knowledge test on your first attempt.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
This Alabama DMV CDL air brake “endorsement” practice test outperforms any traditional study method you may consider using. For instance, study guides merely train you to memorize the answers to the questions. This approach can be frustrating because it limits you to learning surface knowledge, which isn’t sufficient to develop a complete understanding of the air brake system. If you expect to be able to answer complex questions, an in-depth knowledge of this system is essential. The practice test is based on the most recent Alabama DMV CDL manual (Alabama CDL Handbook 2025) and is up to date as of December 2025. If you get a question wrong, you’ll receive a detailed explanation of the correct answer, using information from the CDL manual. The practice test is the most effective and time-efficient way for you to eliminate your misunderstandings. You will be able to understand the logic that supports the correct answers and apply it to your driving practices. Using the practice test, you won’t need to spend valuable time consulting additional resources to correct your wrong answers. The practice test puts the information you need at your fingertips and helps you overcome your learning obstacles.
If you’re launching a career in Rocket City, you’ll find the sky’s the limit for your potential with the superior driving skills you develop using the practice tests at https://driving-tests.org/alabama/.
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.
