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Removing the “L” restriction from your commercial driver’s license (CDL) is essential if you plan to work with commercial motor vehicles (CMVs) equipped with air brakes. That restriction prevents you from doing so and severely limits your career opportunities. To remove the restriction, you must pass the Washington DOL CDL Air Brakes Knowledge Test as well as the Skills Test in an air brake-equipped vehicle. If you fail either, Washington requires a one-day waiting period before retesting and charges a retest fee. Our Washington CDL Air Brakes Practice Tests are designed to help you achieve a first-attempt acing of the exam.
Chief Educational Researcher, Driving‑Tests.org (ACES member)
Last verified for accuracy on
The Air Brakes Knowledge Test is based on Section 5 of the Washington CDL Manual, which covers brake failure prevention, inspection procedures, safe usage, and system components. The test consists of 25 multiple-choice questions, and an 80% score is required to pass. By using our series of practice tests, you receive immediate AI-driven feedback as well as an interactive CDL manual and a Challenge Bank of questions formatted to mimic the official exam. The bonus, however, is that the Challenge Bank continues to question you on incorrect responses until you’ve mastered the material. These methods help you learn as you go, instead of holding all comments until the end. This speeds learning and dramatically increases retention. Ace this one and try another here: https://driving-tests.org/washington/wa-cdl-air-brake-practice-test/.
From steep Cascade Mountain passes like Snoqualmie to the curves and fog often found on the Olympic Peninsula, air brake proficiency is critical. Major commercial routes, including I-5 (a north–south corridor connecting Seattle to Portland and Vancouver, B.C.), I-90 (crossing the Cascades), and US-2 (running through remote and mountainous areas), provide the infrastructure for the transport of materials essential to major state industries. Many that rely on air brake-qualified drivers include aerospace, agriculture, public transportation, technology, timber, and tourism.
Major companies that are constantly hiring air brake-qualified drivers due to their reliance on air brake-equipped vehicles include Amazon, Boeing, Fred Meyer, Greyhound, Microsoft, Northwest Bus Sales, and Werner Enterprises. Washington’s school districts also operate air brake systems on most full-size buses, employing hundreds of drivers statewide. The “L” restriction prevents access to these opportunities and many more.
Consider adding valuable endorsements to your CDL, such as (N) Tanker, (H) Hazardous Materials, and (T) Doubles/Triples. Our Practice Tests can help: https://driving-tests.org/washington/wa-cdl-hazmat-practice-test/. Also, you can prepare for the official combination exam using our Combination Vehicles Practice Tests: https://driving-tests.org/washington/wa-cdl-combination-test/.
Driver’s Ed is - nobody wants to set foot inside the DOL. That’s why millions of learners trust us for simple, visual, effective prep.
We are an officially recognized FMCSA Entry-Level Driver Training provider and a proud partner to over 2,500 libraries. We work with safety organizations like GHSA and the National Safety Council to help create safer roads for everyone.
Our trademarked system automatically saves questions you miss, creating personalized tests that target your weak spots until you’ve mastered the material.
Get smarter as you study. Our new AI-powered feedback provides detailed, question-level insights to help you understand the why behind each answer.
Go beyond the boring black-and-white manual. Our interactive handbook lets you read, listen with an MP3 audio version, or even chat with it to find the information you need, faster.
We build our practice questions from the current 2025 WA Driver Handbook and refine them using patterns recent test‑takers report.
Driver handbook • Knowledge‑test/permit overview • Fees & ID requirements • Office/appointment info
We mirror recurring themes (e.g., right‑of‑way traps, sign look‑alikes) and use similar distractors and wording styles.
We don’t collect or publish actual test items and we’re not affiliated with DOL.
