OR CDL Air Brakes Practice Test 2025

Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
Based on 2025 OR commercial driver's license manual
Triple-checked for accuracy
Updated for March 2025

Air brakes are commonly found on large trucks and buses. They use compressed air to apply pressure to the brake shoes or pads, allowing your vehicle to come to a stop within a safe distance. Your Commercial Driver’s License (CDL) must authorize you to operate vehicles with air brakes, and that’s why you must fully understand how they work.

To operate vehicles equipped with air brakes, you must pass the air brakes knowledge test as well as a skills test in a vehicle equipped with air brakes. Both tests evaluate your knowledge of how this system works, how to inspect your brakes and how to detect brake failure. If you haven’t done so, you will be issued a CDL with a restriction code meaning “No air brake equipped vehicles.”

In Oregon, the written knowledge test is based on the official 2025 CDL manual (https://m.driving-tests.org/oregon/or-cdl-handbook/). Students can use this handbook to familiarize themselves with what it takes to become a commercial driver, but there are other useful resources available for those who are willing to master this subject.

Our Air Brake practice tests give you the opportunity to learn, evaluate your knowledge and identify your mistakes. Consisting of 20 questions, each practice test closely reflects the official written exam. The lack of a timer takes away the pressure of a countdown, allowing students to take as much time as they need before they submit an answer. Read every question twice and analyze each answer before submitting it, so you can fully understand the subject at hand.

A useful feature is immediate feedback, which is provided after each question. You don’t have to wait until the test is over to know which questions you got wrong. The system shows the correct answer and displays a comprehensive explanation, allowing you to identify your mistake and memorize the correct answer while also understanding its meaning.

Pro tip: Use our detailed guides on the Air Brake endorsement and the Air Brake written test to boost your learning journey. Open these guides while you are practicing on our Air Brake practice tests so you can identify the correct answer and associate it with its respective question.

7 min to complete

Available in EN and ES

This test is a Premium member exclusive. You'll get:

All 650 exam-like questions
specific to your state

Interactive learning with
AI personal tutor

Unique 360° Virtual Road
Simulations

Get your money back if you
don’t pass

What to expect on the actual OR DMV exam

questions

correct answers to pass

80%

passing score

Helpful links

OR DMV website

Official Oregon CDL manual (2025)

More OR DMV Written Exam Resources

OR CDL Air Brakes Test

Are you in another state?

Alabama: Test 1 / Test 2
Alaska: Test 1 / Test 2
Arizona: Test 1 / Test 2
Arkansas: Test 1 / Test 2
California: Test 1 / Test 2
Colorado: Test 1 / Test 2
Connecticut: Test 1 / Test 2
Delaware: Test 1 / Test 2
District of Columbia: Test 1 / Test 2
Florida: Test 1 / Test 2
Georgia: Test 1 / Test 2
Hawaii: Test 1 / Test 2
Idaho: Test 1 / Test 2
Illinois: Test 1 / Test 2
Indiana: Test 1 / Test 2
Iowa: Test 1 / Test 2
Kansas: Test 1 / Test 2
Kentucky: Test 1 / Test 2
Louisiana: Test 1 / Test 2
Maine: Test 1 / Test 2
Maryland: Test 1 / Test 2
Massachusetts: Test 1 / Test 2
Michigan: Test 1 / Test 2
Minnesota: Test 1 / Test 2
Mississippi: Test 1 / Test 2
Missouri: Test 1 / Test 2
Montana: Test 1 / Test 2
Nebraska: Test 1 / Test 2
Nevada: Test 1 / Test 2
New Hampshire: Test 1 / Test 2
New Jersey: Test 1 / Test 2
New Mexico: Test 1 / Test 2
New York: Test 1 / Test 2
North Carolina: Test 1 / Test 2
North Dakota: Test 1 / Test 2
Ohio: Test 1 / Test 2
Oklahoma: Test 1 / Test 2
Oregon: Test 1 / Test 2
Pennsylvania: Test 1 / Test 2
Rhode Island: Test 1 / Test 2
South Carolina: Test 1 / Test 2
South Dakota: Test 1 / Test 2
Tennessee: Test 1 / Test 2
Texas: Test 1 / Test 2
Utah: Test 1 / Test 2
Vermont: Test 1 / Test 2
Virginia: Test 1 / Test 2
Washington: Test 1 / Test 2
West Virginia: Test 1 / Test 2
Wisconsin: Test 1 / Test 2
Wyoming: Test 1 / Test 2

Unlock full access with Premium Explore free tests

Our commitment to accuracy and quality in our practice tests

Explore our rigorous, multi-tiered verification process that ensures each question mirrors the official manual for unparalleled accuracy.

Written by Andrei Zakhareuski Updated over a week ago

At Driving-Tests.org, we understand the importance of reliable and accurate practice tests to help you prepare for your DMV exam. That's why we've developed a meticulous process to create and continually update our practice questions, ensuring they reflect the most current driving laws and regulations.

Here's an inside look at how we maintain the highest quality in our practice tests.

Content Creation and Verification Process

Alignment with Official Manuals:
Every question we develop is based on the most recent version of each state's official driving manual. Our team regularly monitors each state DMV's website for the latest updates to ensure our practice tests are always aligned with the most current information.
Community Feedback Integration:
We leverage feedback from our vast community of users to understand which topics are most frequently tested. This helps us focus on the areas that are most relevant and beneficial for your preparation.
Expert Content Creation:
Our in-house editor, Steven, who has extensive experience in driver education, crafts each question with precision. He conducts a thorough review of each question against the official manuals to ensure accuracy.
Rigorous Review Process:
Once Steven has finalized a set of questions, our team conducts a joint review session. This second level of scrutiny involves content accuracy, proofreading, and fact-checking to eliminate any errors.
User Feedback Mechanism:
After a question goes live on our site, we keep the lines of communication open. Each question features a feedback button, inviting users to report any issues or errors. This continuous feedback loop allows us to address and rectify any concerns promptly.
Responsive Updates:
In line with our commitment to accuracy, we quickly update our practice questions to reflect any changes in the DMV manuals. Additionally, we update the free electronic copy of the state's driver's license manuals on our site, typically within a few days after the DMV publishes them.

Our thorough quality control process ensures that you have access to practice tests that are as accurate and up-to-date as possible. We believe in the power of well-prepared drivers and are dedicated to providing you with the best study tools to help you succeed on your DMV exam.

OR CDL Air Brakes Practice Test

Show Test description

Pass the first time, guaranteed

You test results are ready

Pass Your CDL Exams the First Time – Guaranteed

You’re moments from your results. Before viewing them, see how you can get your ELDT certificate and pass — at a fraction of what schools charge.

1,500 Real Exam‐Like Questions Covers every endorsement plus a Pass Guarantee.
FMCSA‐Approved ELDT Official certification, instant completion reporting.
99.06% Pass Rate vs. 49% Avg Trusted by over 1.15 million drivers to succeed first time.