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Our South Carolina DMV CDL Air Brakes Practice Tests are the key to passing your Air Brakes knowledge exam on the first attempt. Failure to pass the South Carolina DMV CDL Air Brakes Knowledge Test means that your CDL will include the restriction “L,” prohibiting you from operating commercial motor vehicles (CMVs) with air brakes. Failing the test in South Carolina also results in a one-day waiting period and a fee should you decide to retake the test. This “L” restriction significantly damages your job prospects in this market.
Because most semi-trucks, tractor-trailers, and commercial buses rely on air brakes for safe navigation, removing the air brake restriction from your CDL is vital for expanded job opportunities. South Carolina features a mix of coastal plains, rolling hills, and the Blue Ridge Mountains as well as urban and rural challenges throughout. Interstate highways like I-26 and I-85 feature hilly and flat regions, where air brakes are essential for vehicle control. Weather in the state brings frequent thunderstorms (especially in the summer) and wintry snow and ice. These impact road conditions and require powerful, reliable braking systems, heightening the demand for air brake-qualified drivers. The major transportation routes include I-26 (connecting Charleston to the western part of the state), I-85 (linking South Carolina with Georgia and North Carolina), I-95 (a vital north-south route), and US-301 (used for regional transport).
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
The Palmetto State demands air brakes in key industries, including manufacturing (automotive and aerospace), agriculture (poultry and cotton), tourism, and logistics. Companies requiring air brake-qualified drivers include BMW (Spartanburg) and Volvo Cars (Charleston) in the manufacturing sector and Mountaire Farms and Perdue Farms in the agriculture industry. XPO Logistics and Old Dominion Freight Line are major logistics companies with fleets of air brake-equipped vehicles. In the charter bus industry, companies like Greyhound Lines, Southeastern Stages, and Carolina Trailways require air brake-qualified drivers, as do the state’s school districts for their full-size buses (employing hundreds of air brake-qualified drivers).
The written Air Brakes knowledge test features multiple-choice questions based on the state’s CDL manual (South Carolina CDL Handbook 2026) and requires a minimum passing score of 80%. Our CDL Air Brakes Practice Tests mimic the official DMV Air Brakes Knowledge Test and cover everything needed to pass it. The instant feedback you’ll receive on all responses will help you learn faster and ensure you pass the knowledge 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 SC 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.
