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Securing a CDL without an air brake restriction is vital for expanded job opportunities in Oklahoma because most semi-trucks and tractor-trailers rely on air brakes for safe navigation. Without passing the Oklahoma DPS CDL Air Brakes Knowledge Test, your CDL will include the restriction “L,” preventing you from operating commercial motor vehicles (CMVs) with air brakes. Failing the air brakes test in Oklahoma results in a one-day waiting period and a retest fee should you decide to retake the test. Our Oklahoma DPS CDL Air Brakes Practice Tests help you pass your knowledge exam on the first attempt.
Due to Oklahoma’s diverse terrain, from the Flat Plains (and high winds) to the steep grades along the mountainous regions (Arbuckle and Wichita Mountains), mastering air brakes is essential. Additionally, winter brings ice storms and heavy rains, and these hazardous conditions require precise braking and air brake-qualified drivers. The major transportation routes I-40 (critical east-west route), I-35 (key north-south freight corridor), I-44 (including the Turner and Will Rogers Turnpikes), and Route 69 (freight transport into eastern Oklahoma) are the lifeblood of the state. As most semi-trucks and tractor-trailers rely on air brakes, restriction “L” would severely limit your job opportunities.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
The Sooner State relies on drivers with the air brake qualification in key industries including energy, agriculture, and manufacturing. Major companies requiring this qualification include Chesapeake Energy, Devon Energy, and ONEOK in the energy sector and Oklahoma Ag Transports and K&J Transports in agriculture. Ditch Witch and Kimberly-Clark are major companies in the manufacturing sector requiring air brake-qualified drivers. Additionally, Village Tours and Jefferson Lines require them in the charter bus industry. Oklahoma also has thousands of full-size school buses that require air brake-qualified drivers. The “L” restriction makes the above-listed jobs unattainable.
Our CDL Air Brakes Practice Tests cover all essential knowledge for the official DPS Air Brakes Knowledge Test. The information you learn will also be useful as you practice inspecting and operating CMVs to pass your skills test. The written Air Brakes knowledge test features multiple-choice questions based on the state’s CDL manual (Oklahoma CDL Handbook 2026) and requires a score of at least 80% to pass.
Our Practice Tests mimic the official knowledge test and offer real-time feedback on all responses. This scientifically proven approach helps you learn faster and ensures you pass the test.
Driver’s Ed is - nobody wants to set foot inside the DPS. 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 2026 OK 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 DPS.
