All your missed questions are saved
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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.
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View All Plans| 90-100 | => | 29% |
| 80-89 | => | 57% |
| 70-79 | => | 14% |
| 60-69 | => | 0% |
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Air brakes play a vital role in keeping you safe while transporting heavily weighted loads, and your ability to operate them is crucial to securing the best driving opportunities. If you want to drive a semi-truck or full-size bus for transportation providers, such as Bridgetown Trucking and TriMet, you must avoid having an “L” restriction on your Oregon Commercial Driver’s License (CDL). With an “L” restriction on your CDL, you are not authorized to operate vehicles equipped with air brakes. Since most semi-trucks, tractor-trailers, and full-size buses use air brakes, an air brake restriction makes it more challenging for you to gain employment. Your ability to operate air brakes helps you slow down to adjust to road conditions and come to a complete stop at intersections and in stalled traffic. The time you take learning about air brakes will be well spent, but you should learn from a comprehensive source.
Our Oregon DMV CDL air brake “endorsement” practice test is designed to expedite the learning process that assists you in removing your air brake restriction. Removing the “L” restriction involves passing a skills test in an air brake-equipped vehicle (including conducting an inspection of the air brakes) and an official Air Brakes Knowledge Test. You must correctly answer at least 80% of the 25 questions on the official knowledge test to receive a passing score and avoid waiting one week to retest.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
This Oregon DMV CDL air brake “endorsement” practice test provides a real-time assessment of your proficiency and identifies the information you should study more. The practice test uses 30 questions, similar to those on the official knowledge test, to determine your readiness and enhance your test-taking skills. You will be provided with a study plan that thoroughly prepares you to overcome your learning obstacles.
Based on the most recent Oregon DMV CDL manual (Oregon CDL Handbook 2026) and up to date as of January 2026, the practice test provides you with reliable information. The practice test uses this authoritative source to explain the correct answers to the questions you get wrong. You can be assured the information provided is accurate and have confidence in applying it to various driving scenarios.
Although more traditional study methods remain available, the practice test excels in providing a higher standard of instruction. Traditional study methods train you to repetitively memorize the answers to the questions without providing information that corrects your misunderstandings. The practice test gives you immediate access to the information you need, boosts your confidence, and increases your chances of passing the official knowledge test on the first attempt.
Eugene is “A Great City for the Arts and Outdoors,” and you can develop advanced driving skills for exploring it with the practice tests at https://driving-tests.org/oregon/.
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 OR 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.
