- Updated for January 2025
- Based on 2025 OR commercial driver's license manual
Free Oregon CDL Air Brakes Test 2025
After you receive your air brake qualification, the sky is the limit, as you can now drive a wider range of commercial vehicles and qualify for better and brighter jobs. The first step towards this qualification though is practicing for the exam. This 30 question multiple-choice format practice exam is closely based on the questions featured in the Oregon Commercial Driver License Manual. The explanation you’ll find with each question has information directly from the manual, so read each one closely as it can help you in the future. Start studying early and often, then practice as many times as you need until you achieve a perfect score. Good luck on your exam, and you’ll soon be driving safely with air brakes!
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual OR DMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- Which of the following is NOT part of the air brake system?
- At what measurement is the safety valve USUALLY set to open?
- When should you drain your air tanks?
- Spring brakes are
- Which of the following are true about a dual air brake system?
- Which of the following can cause brakes to fade or fail?
- The purpose of a supply pressure gauge is
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- How would you check your truck's slack adjusters?
- If the air tanks are not drained,
- How do brakes work on a long, steep downgrade?
- Under which conditions are front wheel brakes good?
- The tractor protection valve
- An antilock braking system (ABS)
- Slack adjusters are
- When should you use the parking brake?
- Why must you pass a knowledge test on air brakes?
- Which of the following is NOT part of the braking process when you're driving a tractor-trailer combination vehicle with an antilock braking system (ABS)?
- Which of the following is NOT part of the drum brake?
- Which vehicles must have low air pressure warning signals?
- What is the best way to test your vehicle's low air pressure warning signal?
- Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
- Which of the following should you do before leaving your vehicle unattended?
- After the initial drop, the maximum acceptable leakage rates per minute are
- The low air pressure warning signal will come on before the pressure in the air tanks falls below
- A low pressure warning signal is required on
- All vehicles equipped with air brakes have
- With air brake-equipped vehicles, the parking brakes should be used
- The use of air brakes on a downgrade is only a supplement to the
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