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- Updated for January 2025
- Based on 2025 OR commercial driver's license manual
OR CDL Air Brakes Practice Test 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://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.
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
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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:
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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.
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