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View All PlansIf you plan to operate commercial motor vehicles (CMVs) equipped with air brakes, passing the Arizona MVD Air Brakes Knowledge Test is essential. Failure to pass the test results in the retention of the restriction “L” on your CDL, which means you cannot legally drive air brake-equipped vehicles. Since most large CMVs (including semi-trucks, tractor-trailers, and full-size buses) are equipped with air brakes, this is a serious limitation in the commercial transport industry.
From Phoenix’s desert freeways to the I-17 ascent toward Flagstaff and the rugged mountain routes through the Mogollon Rim, drivers face significant driving challenges and steep roadways. The Grand Canyon State’s high-altitude roads in the north, intense heat in the south, and winds on open desert stretches make air brake systems and their proper inspection and operation essential. Highways like I-10, I-17, I-40, and State Routes 60 and 87 serve as major roadways, connecting ports, mining towns, and industrial hubs throughout the state.
Industries from mining (Freeport-McMoRan, Asarco) to logistics (Knight Transportation, Swift, XPO Logistics) depend on air brake-qualified drivers. The same is true for tourism and charter transportation, including companies like Arrow Stage Lines, Greyhound, and Tour West America, and school districts across the state operating full-size buses equipped with air brakes.
The Air Brakes Knowledge Test is a multiple-choice exam requiring at least 80% correct answers to pass. You’ll be tested on air brake systems, how to inspect them, and how to identify and handle system failures. Failing the exam requires a one-business-day waiting period and a retest fee. Our experts have created a series of Arizona Air Brakes Practice Tests to ensure you pass on your first attempt!
Our Arizona CDL Air Brakes Practice Tests are based on the MVD CDL Manual and modeled after the real exam. Each question mirrors what you’ll see on test day and offers instant feedback proven to speed learning and increase retention. Once you’ve aced this practice test, try another one here: https://driving-tests.org/arizona/az-cdl-air-brake-practice-test/.
You’ll also need to pass the skills test in an air brake-equipped vehicle, which includes an inspection covering air system components and leaks, a hands-on air pressure test and brake check, and road performance.
Check out one of our Endorsement Practice Tests to add marketability to your CDL: https://driving-tests.org/arizona/az-cdl-hazmat-practice-test/. You should also consider testing for the Class A CDL, which allows you to operate tractor-trailers and other combination vehicles. Our practice tests can help with that, too: https://driving-tests.org/arizona/az-cdl-combination-test/.
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