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All that stands in the way of your commercial driver’s license (CDL) being free of the “L” restriction is passing the New Hampshire DMV CDL Air Brakes Knowledge Test and the Skills Test in a vehicle equipped with air brakes. Failing either of these tests (or taking the Skills Test in a vehicle without air brakes) means your CDL will prohibit you from operating any commercial motor vehicle (CMV) equipped with air brakes. That little “L” will impose a serious limitation on your employability in the Granite State. If you do not pass, New Hampshire requires a one-day waiting period and an additional fee before retesting. Our New Hampshire DMV CDL Air Brakes Practice Tests are built to help you pass the first time.
Key topics on the official knowledge test include components, functions, and proper use of air brake systems, brake lag, stopping distances, system monitoring, dual air systems, and inspecting and maintaining air brakes. That’s a tremendous amount of material, and the official multiple-choice written test requires a passing score of at least 80%. Our practice tests replicate the official exam and include instant feedback, AI-driven explanations, an interactive CDL Manual, and a Challenge Bank that remembers missed questions until you answer them correctly. Once you’ve aced this practice test, try another one here: https://driving-tests.org/new-hampshire/nh-cdl-air-brake-practice-test/.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
New Hampshire’s major highways include I-93, US-4, and US-112. They feature steep grades, winding passages, and winter ice, just some of the hazards that necessitate air brakes for maintaining safe control of heavy vehicles. Because most tractor-trailers, semi-trucks, motorcoaches, and full-size school buses rely on air brakes, removing this restriction is essential to expanding your driving opportunities.
The Granite State’s economy depends on commercial drivers who are air brake-qualified. Major sectors, including trucking and freight, passenger and charter transportation, logging and timber, and even public education, rely on drivers qualified for air brake-equipped CMVs. Major employers in the state that require them include BW Timber Harvesting, Concord Coach Lines, Dartmouth Coach, L.A. Limousine, Land Air Express, Lumberjack Logging Company LLC, and Timberwolf Logging.
Add endorsements like (N) Tanker, (H) Hazardous Materials, and (T) Doubles/Triples to your CDL for additional versatility and job opportunities. Check out our practice tests for this as well: https://driving-tests.org/new-hampshire/nh-cdl-hazmat-practice-test/. You might also try our Combination Vehicles Practice Tests in preparation for the required knowledge exam needed for obtaining a Class A License: https://driving-tests.org/new-hampshire/nh-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 NH 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.
