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Failure to pass the Michigan SOS CDL Air Brakes Knowledge Test means that your CDL will include the restriction “L.” This restriction will affect your job prospects by preventing you from operating commercial motor vehicles (CMVs) with air brakes. Failing the air brakes test in Michigan results in a one-day waiting period and a fee should you decide to retake the test. Our Michigan SOS CDL Air Brakes Practice Tests are your key to passing on the first attempt.
Chief Educational Researcher, Driving‑Tests.org (ACES member)
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From its steep hills and sharp curves to its flat plains and forested areas, Michigan poses challenging driving conditions that demand the reliability of an air brake system. The coastal routes experience heavy fog, wind, and rain, which are compounded in winter when the snowy, icy roads make air brake proficiency essential for commercial drivers. Key transportation routes in the state include I-75 (a major north-south highway connecting Detroit to Canada), I-94 (an east-west corridor connecting Detroit to Chicago and the western U.S.), and US-23 (a north-south road passing through rural areas).
The Great Lakes State relies on drivers with the air brake qualification in such industries as automotive manufacturing (Detroit is the center of the U.S. auto industry), manufacturing and engineering, agriculture, and tourism (Great Lakes and Mackinac Island). Companies requiring air brake-qualified drivers include Con-way Freight and Ryder (both in Detroit) in the trucking industry and Greyhound Lines (Detroit) and Indian Trails (Owosso) in the charter bus sector. The state’s automotive industry includes companies like Ascent Global Logistics, Hollingsworth, and ICAT Logistics Detroit, which rely on air brake-equipped CMVs. Stoller Trucking, LLC, Brink Farms, and Willow Creek Trucking require the same in the agriculture sector. Michigan’s school districts use air brakes on their full-size buses providing hundreds of jobs. Since most semi-trucks, tractor-trailers, and commercial buses rely on air brakes for safe navigation, removing the air brake restriction from your CDL is crucial for these job opportunities.
The multiple-choice Air Brakes knowledge test is based on the state’s CDL manual (Michigan CDL Handbook 2025) and requires a minimum passing score of 80%. Our CDL Air Brakes Practice Tests fully prepare you for the official SOS Air Brakes Knowledge Test. You’ll receive instant feedback on all our Practice Test responses, and our tests mimic the official knowledge test. This method speeds learning and ensures you pass!
Driver’s Ed is - nobody wants to set foot inside the SOS. 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 MI 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 SOS.
