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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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Securing a commercial driver’s license (CDL) without the air brake restriction is absolutely essential in Vermont for commercial motor vehicle (CMV) operators because the majority of them are air brake-equipped. Without the air brake restriction, the doors are open to a significantly larger number of jobs driving large CMVs, such as tractor-trailers and full-size buses. With the restriction, a CDL is close to useless for that purpose. Failing the Vermont DMV CDL Air Brakes Knowledge Test retains the restriction “L” on your license. This tiny letter prohibits you from operating CMVs equipped with air brakes. Failing the Air Brakes Knowledge Test also results in a minimum one-business-day wait and a retest fee. Our Vermont DMV CDL Air Brakes Practice Tests are designed to help you pass the official exam on your very first attempt.
When hauling cargo through tricky corridors like I-89, I-91, US-7, and US-4, the Vermont winters add even more challenges with icy roads, heavy snow, and freezing rain. These hazards demand reliable braking, and air brakes are necessary on many CMVs. Major industries in the state, including dairy products, maple syrup, timber, and tourism and charter services, rely on vehicles equipped with air brakes. Companies such as Emerson & Sons Logging, Farm Connex, Goodrich Maple Farm, and Premier Coach in Williston rely on drivers trained in mountain-grade braking. Even school districts statewide require air brake-qualified operators, since most full–size buses operate using air brake systems. Without passing the air brakes test, you are shut out of these positions across the Green Mountain State.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
The written knowledge exam consists of multiple-choice questions based on the official CDL manual and requires a minimum score of 80% to pass. You’ll be tested on topics like braking procedures, inspection requirements, system components, and troubleshooting. Our practice tests replicate the format of the DMV Air Brakes Knowledge Test and provide immediate responses so you can learn as you go. Our state-of-the-art Challenge Bank continues to test you on missed questions and concepts until you answer correctly. This method accelerates learning and substantially improves retention. Once you’ve mastered this practice test, try another: https://driving-tests.org/vermont/vt-cdl-air-brake-practice-test/.
While you’re at it, endorsements such as T – Doubles/Triples, N – Tank Vehicles, H – Hazardous Materials, and X – Tank and Hazmat Combined increase your marketability. Check out one of our Endorsement Practice Tests: https://driving-tests.org/vermont/vt-cdl-hazmat-practice-test/. Consider preparing for the Combination Vehicles Knowledge Test (one of the requirements needed to obtain a Class A License): https://driving-tests.org/vermont/vt-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 2026 VT 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.
