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An “L” restriction on your North Carolina Commercial Driver’s (CDL) could put a full-court press on your driving opportunities and disrupt your earnings potential. The “L” restriction prohibits you from driving vehicles equipped with air brakes, which makes it more difficult to gain employment with private and public sector employers, such as McGirt Trucking and Go Triangle. Most semi-trucks and full-size buses are equipped with air brakes, and your ability to operate these systems preserves your safety. Air brakes help you regulate your speed and come to a complete stop while transporting heavy loads. Changing road situations, like adverse weather, steep curves, and stalled traffic, require abrupt adjustments to your speed. An extensive knowledge of air brakes allows you to safely navigate these conditions.
Our North Carolina DMV CDL air brake “endorsement” practice test helps you obtain and absorb the information needed to develop a firm grasp of air brake operations. The practice test prepares you to demonstrate your ability to drive an air brake-equipped vehicle, perform an inspection of the air brake system, and pass an official Air Brakes Knowledge Test. You must successfully complete each of these steps to remove the “L” restriction from your CDL. The practice test contains 30 questions similar to those on the official knowledge test to determine your proficiency and identify the information you should study to increase it. You are required to correctly answer at least 80% of the 25 questions on the official knowledge test to pass, and the practice test can help you succeed.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
This North Carolina DMV CDL air brake “endorsement” practice test is designed to be user-friendly and strategically remove your learning barriers using reliable information. The practice test is based on the most recent North Carolina DMV CDL manual (North Carolina CDL Handbook 2025) and is up to date as of December 2025. If you submit an incorrect answer, the practice test fully explains the correct one with information from the CDL manual. Since the information comes from the most authoritative source, you can be confident in its validity and apply it to various driving scenarios. The practice test is an innovative study method that gives you immediate access to the information to correct your misunderstandings.
Unlike the practice test, traditional study methods aren’t designed to help you overcome your specific learning obstacles. Traditional study methods tend not to be interactive, and they rely on your ability to memorize the answers to the questions. This approach fails to provide you with the crucial information you must know to understand the essential functions and components of air brakes. You are more likely to become frustrated and consult additional resources to find the information you need. The practice test is your one-stop shop to learn about air brakes, boost your confidence, and increase your chances of passing the official knowledge test on your first try.
The Biltmore House offers a glimpse into the Gilded Age, and you can show off your lavish driving skills using the practice tests at https://driving-tests.org/north-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 2025 NC 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.
