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A CDL without an air brake restriction is essential for maximizing your job prospects, since most semi-trucks and tractor-trailers rely on air brakes. Failing to pass the Montana MVD CDL Air Brakes Knowledge Test results in an “L” restriction on your CDL, preventing you from operating vehicles equipped with air brakes. Failing the test also results in a one-day waiting period and a retest fee. Our Montana MVD CDL Air Brakes Practice Tests are designed to help you pass your knowledge exam on the first attempt.
From Montana’s rugged mountains to the frequent high winds and flooding on its plains, the terrain requires air brake-qualified drivers for heavy rigs. The deep snow and ice in winter compounds this need for a reliable air brake system. Major transportation routes in Montana include I-90 (a major freight corridor crossing the mountains), I-15 (a north-south route with steep inclines), I-94 (an eastern highway crucial for freight). The “L” restriction severely limits your driving options on these highways and the many jobs provided.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
Industries across the Big Sky State that rely on drivers with the air brake qualification include agriculture, energy, mining, and tourism. Major companies requiring air brakes include CHS Inc. and RMA Energy in the agriculture sector and Montana Resources and ExxonMobil in the mining and energy sectors. XPO Logistics and UPS are major players in the freight and logistics industry that require air brake-qualified drivers. So do Greyhound Lines and Total Transportation in the tourism industry. Finally, school districts across the state use full-size air brake-equipped school buses, employing hundreds of qualified drivers. The “L” restriction makes operating CMVs equipped with air brakes illegal, eliminating the above-listed employment options.
The written Air Brakes knowledge test features multiple-choice questions based on the state’s CDL manual (Montana CDL Handbook 2025) and requires a minimum passing score of 80%. Our CDL Air Brakes Practice Tests cover all essential knowledge for the official MVD Air Brakes knowledge test. The information you learn will also help prepare you for your skills test, which includes inspecting components, testing for air pressure and leaks, and operating air brake-equipped vehicles.
Our Practice Tests are designed to resemble what you will face on the official test and offer real-time feedback on all responses. This scientifically proven approach improves material retention and ensures you’re prepared to pass the test.
Driver’s Ed is - nobody wants to set foot inside the MVD. 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 MT 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 MVD.
