All your missed questions are saved
automatically for extra practice.
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.
View All PlansAdding difficult questions to Challenge Bank™ is an exclusive Premium feature. Unlock access to 650+ exam-like questions, a Pass Guarantee, personalized study plans, and more.
View All Plans| 90-100 | => | 13% |
| 80-89 | => | 53% |
| 70-79 | => | 20% |
| 60-69 | => | 13% |
| <60% | => | 0% |
Our South Carolina DMV CDL Air Brakes Practice Tests give you the surest path to passing your Air Brakes Knowledge Exam on the first attempt. Until you pass the official test, your CDL will carry the “L” restriction, which will prohibit you from operating commercial motor vehicles with air brakes, significantly limiting your employment opportunities. If you fail the test, South Carolina requires a one-day waiting period and a fee before retesting. Because most commercial motor vehicles (CMVs) rely on air brakes, this restriction closes the doors to many jobs in the Palmetto State.
From the ports around Charleston, the manufacturing out of Spartanburg, and the distribution networks along I-26, I-85, and I-95, companies depend on drivers who are air brake-qualified. Major industries reliant on air brake-qualified drivers include agriculture, automotive equipment manufacturing, chemicals and raw materials handling, courier services, distribution and warehousing, manufacturing and industrial production, port and maritime logistics, specialized freight and tanker operations, and transportation and logistics. Major companies in the area that regularly hire air brake-qualified drivers include AR&D Trucking Company Inc., Carolina Logistics Inc., Carey Moving and Storage, Dedicated Transportation Solutions, Estes Express Lines, Randolph Trucking, Service Transportation, Inc., Southeastern Freight Lines, and Tri Star Freight System Inc.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
A minimum 80% passing grade requirement is in place for the knowledge exam. With so many opportunities available and so many delays and added fees if you don’t pass, our Air Brakes Practice Tests are exactly what you need to pass on your first attempt. Our practice tests mirror the official exam and are designed to familiarize you with the sometimes tricky wording, distractors, and double negatives often found on the official exam. For each response, you will receive AI-driven feedback helping you retain more information as you go and learn the material faster. Our practice tests also feature an interactive CDL Manual and our revolutionary Challenge Bank of questions that remembers any you miss and presents those questions repeatedly until you answer them correctly. With our preparation materials, you will enter the official testing site ready for anything they throw at you. Try another practice test here: https://driving-tests.org/south-carolina/sc-cdl-air-brake-practice-test/.
Pass the first time, lift the “L” restriction, and open the Palmetto State doors wide open to new job opportunities. Consider adding valuable endorsements to your CDL, such as (N) Tanker, (H) Hazardous Materials, and (T) Doubles/Triples. Our Practice Tests can help: https://driving-tests.org/south-carolina/sc-cdl-hazmat-practice-test/. Also, consider preparing for the official combination exam with our Combination Vehicles Practice Tests: https://driving-tests.org/south-carolina/sc-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 2025 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.
