- Updated for January 2025
- Based on 2025 WA commercial driver's license manual
Free Washington CDL Air Brakes Test 2025
Today, you can start preparing for something that will enrich your career and make you stand out in the trucking field in Washington: your air brake qualification. This will broaden your options, and you will be able to drive a much wider range of commercial vehicles. The 30 question multiple-choice format practice exam you are about to take is closely based on the questions featured in the Washington Department of Licensing Commercial Driver Guide, and features necessary safety information about driving and maintaining an air brake vehicle. Read each hint and explanation to gather all of the information we’ve condensed from the driver guide into your practice exam. Study early and practice as often as you need to until you achieve a score that you feel comfortable with. Good luck on your practice exam, your future CDL air brake 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 WA DOL exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
- When should you use the parking brake?
- What is the best way to test your vehicle's low air pressure warning signal?
- How would you check your truck's slack adjusters?
- 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)?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- Which of the following is NOT part of the drum brake?
- The purpose of a supply pressure gauge is
- Why must you pass a knowledge test on air brakes?
- Under which conditions are front wheel brakes good?
- Which of the following should you do before leaving your vehicle unattended?
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- An antilock braking system (ABS)
- Which vehicles must have low air pressure warning signals?
- Slack adjusters are
- After the initial drop, the maximum acceptable leakage rates per minute are
- Which of the following can cause brakes to fade or fail?
- Spring brakes are
- If the air tanks are not drained,
- Which of the following is NOT part of the air brake system?
- Which of the following are true about a dual air brake system?
- How do brakes work on a long, steep downgrade?
- When should you drain your air tanks?
- At what measurement is the safety valve USUALLY set to open?
- The tractor protection valve
- 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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