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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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Passing your South Dakota DMV CDL Air Brakes Knowledge Test is essential if you want access to commercial driving opportunities in air brake-equipped vehicles across the state. If you do not pass this test, the “L” restriction will stay on your CDL, preventing you from operating any CMV equipped with air brakes. That limitation immediately blocks a wide range of opportunities in industries where air brake-equipped vehicles are necessary. You’ll also face a mandatory one-day waiting period and must pay a retest fee before taking the exam again. Our South Dakota CDL Air Brakes Practice Tests are specifically designed to help you succeed on your first attempt, ensuring you avoid delays and added fees.
On South Dakota’s long stretches of I-90 (linking Sioux Falls with Rapid City) and I-29 (to and from Canada), dependable braking systems are a must for most CMVs. From the windy flat plains to the tight curves and steep grades on US 16A, drivers must rely on precise air brake performance. Companies throughout the Mount Rushmore State use these roads to keep major industries like agriculture, manufacturing, and tourism flourishing. Drivers who possess the air brake qualification are commonly hired. Even the school districts across the state use full-size buses with air brake systems, creating hundreds of jobs that are unavailable to any driver carrying the “L” restriction.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
The official Air Brakes Test consists of 25 multiple-choice questions, and a minimum passing score of 80% is required. Our practice tests are modeled after this official format. You’ll receive immediate feedback on each response, helping you learn the material more efficiently. Additionally, our practice tests feature AI-driven content and an interactive CDL Manual to speed learning and boost retention. Our state-of-the-art Challenge Bank of questions actually remembers any you miss and continues to present that material until you’ve proven mastery. Once you ace this practice test, try another here: https://driving-tests.org/south-dakota/sd-cdl-air-brake-practice-test/.
Removing this restriction is a way to set yourself apart from those without the qualification. To further diversify your marketability, you should consider adding valuable endorsements to your CDL, such as (N) Tanker, (H) Hazardous Materials, and (T) Doubles/Triples. Our Practice Tests are here to help: https://driving-tests.org/south-dakota/sd-cdl-hazmat-practice-test/. Also, consider preparing for the official combination exam (a step required for a Class A License) with our Combination Vehicles Practice Tests: https://driving-tests.org/south-dakota/sd-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 SD 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.
