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While you’re deciding on endorsements for your South Carolina Commercial Driver’s License (CDL), it is important to avoid having an “L” restriction on it. Air brake systems are an essential safety feature on most semi-trucks and full-size buses, and the “L” restriction prohibits you from driving vehicles equipped with them. These systems allow you to apply ample braking force to slow down or stop while transporting heavily weighted loads. Safety is a priority for private and public transportation providers, such as Superior Transportation and Greenlink Transit, and air brake-qualified drivers are more successful in obtaining employment with them. Your ability to slow down or stop for black ice, steep inclines, and other hazardous road conditions is critical. Developing an extensive knowledge of air brakes keeps you safe and free of an “L” restriction.
Using an interactive approach, our South Carolina DMV CDL air brake “endorsement” practice test is designed to help you exhibit a thorough knowledge of air brakes. You must demonstrate your ability to drive an air brake-equipped vehicle, perform an inspection of the air brake system, and pass an official Air brake Knowledge Test to remove the “L” restriction. The practice test is a resourceful tool for establishing an effective study plan. You must correctly answer at least 80% of the 25 questions on the official knowledge test to pass. The practice test provides 30 questions to evaluate your current knowledge base, identify the information you should study more, and provide the additional instruction necessary to achieve your goals.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
This South Carolina DMV CDL air brake “endorsement” practice test wastes no time in addressing your misunderstandings, using the most reliable and authoritative information. The practice test is based on the most recent South Carolina DMV CDL manual (South Carolina CDL Handbook 2026) and is up to date as of January 2026. If you submit an incorrect answer, the practice test immediately provides a detailed explanation of the correct one. The information is derived from the CDL manual and can be applied to various driving scenarios you may encounter on the official knowledge test. This approach is beneficial for rapidly developing your knowledge and increasing your confidence in using air brakes.
Unlike the practice test, traditional study methods have shown themselves to be less effective and more time-consuming. Traditional study methods use a much different approach: training you to memorize the answers to the questions. You can’t expect such a study method to sufficiently address your specific learning obstacles. Traditional study methods fail to provide you with the information you must learn to correct your misunderstandings and force you to spend time conducting your own research. The practice test makes this information convenient to obtain, boosts your confidence, and increases your chances of passing the official knowledge test on your first attempt.
G-Vegas may have resembled that gambling mecca in the desert, but you won’t mistake the power of the profitable driving skills you’ll develop using the practice tests at https://driving-tests.org/south-carolina/.
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.
