- Updated for March 2025
- Based on 2025 WA commercial driver's license manual
Free Washington CDL Air Brakes Test 2025
The restriction “L” on your CDL will prevent you from operating commercial motor vehicles (CMVs) with air brakes. This restriction can significantly damage your job prospects in commercial driving. You must pass the Washington DOL CDL Air Brakes Knowledge Test to have this restriction removed. Failing the air brakes test in Washington will also result in a one-day waiting period and a fee should you decide to retake the test. Our Washington DOL CDL Air Brakes Practice Tests will help you pass your knowledge exam on the first attempt.
Since most semi-trucks, tractor-trailers, and commercial buses are equipped with air brakes for safe navigation, removing the air brake restriction from your CDL is crucial for expanded job opportunities. Key transportation routes in the state include I-5 (the north-south highway connecting Seattle to Portland and Vancouver, British Columbia), I-90 (an east-west corridor crossing the Cascade Mountains), and US-2 (an east-west route connecting to rural and mountainous areas). From the steep grades and sharp turns in the Cascade Range (Snoqualmie Pass) to the narrow, winding (and often foggy) roads along the Olympic Peninsula, Washington’s terrain presents multiple hazards demanding air brake-qualified drivers. Western Washington’s high precipitation brings slippery roads, compounding this need.
The Evergreen State relies on air brake-qualified drivers in industries including technology (Seattle, home to Microsoft and Amazon), aerospace (Boeing in Everett), agriculture, and timber and forestry. Other companies requiring the qualification include Fred Meyer and Werner Enterprises in the grocery distribution and trucking industry and Greyhound Lines (Seattle) and Northwest Bus Sales (Tacoma) in the charter bus sector. In the timber and logging industry, Weyerhaeuser Company (Seattle) and Green Diamond Resource Company (Shelton) rely on air-brake-equipped trucks. So do Trident Seafoods Corporation and Ocean Beauty Seafoods (Seattle). Washington’s school districts use air brakes on most full-size buses, employing hundreds of drivers. The “L” restriction closes access to these jobs.
The information learned from our CDL Air Brakes Practice Tests will fully prepare you for the official DOL Air Brakes Knowledge Test and help you pass your skills test. The knowledge test features multiple-choice questions based on the state’s CDL manual (Washington CDL Handbook 2025) and has a minimum passing score of 80%.
Our practice tests mimic the official knowledge test, provide immediate feedback on all responses, and help ensure you pass the knowledge test!
- 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
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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