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 PlansYou have come to the right place for a sure-fire method of passing your Oregon DMV CDL Air Brakes Knowledge Test on your first attempt. Without passing the knowledge test, your CDL will include the restriction “L,” preventing you from operating commercial motor vehicles (CMVs) with air brakes. Securing a CDL without this restriction is vital for expanded job opportunities in Oregon because most semi-trucks and tractor-trailers rely on air brakes. Failing the air brakes test in Oregon results in a one-day waiting period and a retest fee should you decide to retake the test. Use our Oregon DMV CDL Air Brakes Practice Tests to pass on the first attempt.
The steep grades, sharp curves, and elevation changes in the Cascade Mountains, the coastal range, and the high desert areas demand air brakes for brake reliability. The wintry mountain passes are especially challenging and need air brake-qualified drivers. Key transportation routes include I-5 (connecting Portland, Salem, and Eugene), I-84 (winding through the Columbia River Gorge), US-26 (major east-west route), and OR-58 (with its steep descents and curves, particularly near Willamette Pass). As most semi-trucks and tractor-trailers rely on air brakes, restriction “L” would severely limit your job opportunities.
The Beaver State relies on drivers with the air brake qualification in key industries, including timber and logging (one of the largest lumber producers in the U.S.), agriculture, and technology and manufacturing (Intel and Nike). Other major companies requiring this qualification include Schneider National (Portland), Old Dominion Freight Line, FedEx, and UPS as well as TriMet (Portland), Greyhound, and FlixBus in the public transit and charter bus industries. School districts across Oregon also employ thousands of full-size school bus drivers and require the air brake qualification.
Our CDL Air Brakes Practice Tests cover everything needed for the official DMV Air Brakes Knowledge Test. What you learn will also help you practice inspecting and operating CMVs to pass your skills test. The written Air Brakes knowledge test features multiple-choice questions based on the state’s CDL manual (Oregon CDL Handbook 2025) and requires a score of at least 80% to pass.
Our Practice Tests mimic the official knowledge test and offer real-time feedback on all responses. This scientifically proven approach helps you learn faster and ensures you pass the test.
Chief Educational Researcher, Driving‑Tests.org (ACES member)
Verified for accuracy December 2025
Methodology & Editorial Policy
questions
correct answers to pass
passing score
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.
