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Transportation providers, such as Sparhawk Trucking and Milwaukee County Transit, depend on air brake-qualified drivers to deliver their services. If you lack an understanding of air brakes, your Wisconsin Commercial Driver’s License (CDL) will include the “L” restriction, which keeps you from driving vehicles with air brakes. Since most semi-trucks and full-size buses are equipped with air brakes, the “L” restriction is a major hurdle to securing the best job opportunities. More braking force is required for vehicles carrying heavily weighted loads to slow down or come to a complete stop. Air brakes allow you to adjust your speed to safely navigate changing driving conditions, such as heavy snowfall, narrow bridges, and heavy traffic. Your ability to competently operate air brakes is vital to your safety and requires expert training.
Using an innovative approach, our Wisconsin DMV CDL air brake “endorsement” practice test prepares you to remove the “L” restriction from your CDL. Removing the “L” restriction requires you to demonstrate your ability to drive an air brake-equipped vehicle, inspect the air brake system, and pass an official Air Brakes Knowledge Test. By correctly answering at least 80% of the 25 questions on the official knowledge test, you will earn a passing score. The practice test provides you with the instruction to achieve this score and helps you apply it toward satisfying the other requirements. Using 30 questions, the practice test helps you establish a baseline of your current air brake knowledge and strategically assists you in expanding it.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
This Wisconsin DMV CDL air brake “endorsement” practice test provides reliable information to equip you to meet the challenges of the official knowledge test. Based on the most recent Wisconsin DMV CDL manual (Wisconsin CDL Handbook 2025) and up to date as of December 2025, the practice test provides the essential information you must learn and teaches you how to apply it to your driving practices. If you submit an incorrect answer, the practice test uses information from the CDL manual to explain the correct one. You can be confident in the authenticity of this information and its ability to further develop your knowledge of air brake operations.
Unlike the practice test, traditional study methods are designed to be one-dimensional and limit you to learning surface knowledge. Traditional study methods measure your success by assessing your ability to memorize the answers to the questions. This approach makes no effort to give you the information you need to correct your wrong answers and better understand air brakes. With its interactive capability, the practice test is able to target your specific learning obstacles and immediately provide the information to overcome them. You can depend on the practice test to provide comprehensive instruction, boost your confidence, and increase your chances of passing the official knowledge test on your first try.
Cheesehead foam hats make quite a fashion statement, and you can declare your knowledge of excellent driving skills with the practice tests at https://driving-tests.org/wisconsin/.
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 WI 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.
