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The Texas DMV CDL Air Brakes Knowledge Test is one of two major tests that must be passed if you want a commercial driver’s license (CDL) with the allowance to drive air brake-equipped vehicles. Without a passing score, the “L” restriction will remain on your CDL, making it illegal to operate any CMV equipped with air brakes. That restriction immediately closes the door to the majority of trucking jobs, as most CMVs are equipped with air brakes. Failing the exam also triggers a one-day waiting period and a retesting fee before making another attempt. Our Texas CDL Air Brakes Practice Tests are designed to help you pass on your first try, getting you on the road faster.
The official Air Brakes Knowledge Test is a multiple-choice exam requiring a minimum score of 80% to pass. The content includes system components, pressure and leak test procedures, safe braking methods, and malfunction prevention. You’ll also need to pass the Skills Test in an air brake-equipped vehicle if you want the air brake restriction removed. During that exam, you’ll conduct inspections, check air pressure systems, detect leaks, and demonstrate safe brake operation in an air brake-equipped vehicle.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
Our Texas CDL Air Brakes Practice Tests simulate the official exam, which has been shown to present tricky wording, distractors, double negatives, and common word traps that can confuse test-takers. Our practice tests familiarize you with these tactics so you’re ready before you even walk into the test site. Our practice tests deliver immediate AI-driven feedback and an interactive CDL Manual to strengthen retention and speed learning. Furthermore, our Challenge Bank repeatedly presents questions until you answer them correctly, ensuring you have each question aced before moving on. Check out another practice test here: https://driving-tests.org/texas/tx-cdl-air-brake-practice-test/
Texas is one of the largest freight and logistics hubs in the nation, serving as a link between the U.S. and Mexico. The state’s major interstates include I-10, I-20, I-35, and I-45, which make it possible for industries like agriculture, manufacturing, oil and gas, technology, and tourism to flourish. Major employers that often hire air brake-qualified drivers include ExxonMobil, Greyhound, Halliburton, JBS, Pilgrim’s Pride, Texas Instruments, and Texas Trails. Even full-size buses use air brakes, making the qualification necessary for many passenger and municipal transport careers. With the “L” restriction in place, your job prospects diminish dramatically.
Consider endorsements for your CDL, such as (N) Tanker, (H) Hazardous Materials, and (T) Doubles/Triples. Our Practice Tests can help: https://driving-tests.org/texas/tx-cdl-hazmat-practice-test/. Also, prepare for the official combination exam with our Combination Vehicles Practice Tests https://driving-tests.org/texas/tx-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 TX 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.
