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While you may think you’re ready to drive for the Sadler Brothers or shuttle tourists to Opryland, the “L” restriction on your Tennessee Commercial Driver’s License may be telling a different story. An “L” restriction does not permit you to operate a vehicle equipped with air brakes. Most semi-trucks and full-size buses are air brake-equipped and require drivers with a specific skill set to drive them. Heavily weighted loads require more braking force to allow a vehicle to slow down or come to a complete stop. In your travels, you are likely to encounter rapidly changing road conditions, such as icy roads, narrow lanes, and traffic jams, requiring you to react quickly. Air brakes make it possible for you to safely navigate these situations, and your ability to manage them is attractive to potential employers.
Using our Tennessee DMV CDL air brake “endorsement” practice test, you can start developing an extensive knowledge of air brakes. Driving an air brake-equipped vehicle, performing an inspection of the air brake system, and passing an Air Brake Knowledge Test are the requirements for removing the “L” restriction from your CDL. The practice test is expertly designed to help you correctly answer at least 80% of the 25 questions on the official knowledge test to get a passing score. Starting with an initial assessment of your current knowledge, the practice test uses its 30 questions to identify the information you must better understand and form a study plan. You will be provided with the blueprint for achieving your goals in an effective and time-efficient manner.
M.S., Chief Educational Researcher (ACES member)
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This Tennessee DMV air brake “endorsement” practice test stimulates your learning process with an interactive approach to addressing your misunderstandings. The practice test provides feedback on the questions you get wrong, using authoritative information. You can be confident in the information provided because it is taken from the most recent Tennessee DMV CDL manual (Tennessee CDL Handbook 2025) and is up to date as of December 2025. If you submit an incorrect answer, the practice test offers a thorough explanation of the correct one. This approach is effective in helping you absorb the information and apply it to various driving scenarios.
Although you could use more traditional study methods, the practice test exceeds their ability to thoroughly prepare you to meet the challenges of the official knowledge test. Traditional study methods do not provide you with comprehensive instruction to fill your knowledge gaps. Instead, you are merely trained to memorize the answers to the questions and expected to do your own research on the information to correct your misunderstandings. This approach is more concerned with teaching you surface knowledge than with maximizing your driving skills. You can depend on the practice test to fully develop your understanding of air brakes and increase your chances of passing the official knowledge test on your first try.
Nearest Green taught Jack Daniels the art of distilling whiskey, and you can learn artistic driving skills using the practice tests at https://driving-tests.org/tennessee/.
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 TN 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.
