WI CDL Air Brakes Practice Test 4 2025

Here in America’s Dairyland, most Class A and Class B commercial trucks use air brakes for safety and compliance. Manufacturing hubs in Green Bay, Manitowoc, Milwaukee, and Oshkosh move heavy freight via tractor-trailers that require precise air brake control. Tourism routes throughout Door County and along Lake Michigan and the Wisconsin Dells often include steep grades, lakeside winds, fog, and winter conditions that demand air brakes. Wisconsin’s winter snowfall, slick roads, and high winds along I-90/I-94, I-43, and US-51 create situations where safe air brake handling is critical.

Major Wisconsin employers like Badger Bus, J.B. Hunt, Lamers Bus Lines, Schneider National, and agricultural and dairy logistics carriers like Lemke Brothers Trucking and Martin’s Milk Service routinely require air brake-qualified drivers. Make no mistake, securing the air brake qualification is an enormous step toward a much larger job pool.

The Air Brakes Knowledge Test consists of 25 multiple-choice questions based on Section 5 of the CDL Manual and requires a minimum score of 80% to pass. Our practice tests provide instant AI-driven feedback, and our experts have worked hard to eliminate unnecessary fluff from the study materials and focus on the materials you need to pass the exam. Our practice tests also feature an interactive CDL Manual as well as our state-of-the-art Challenge Bank, designed to repeat any questions you miss until you’ve proven mastery of the material. Once you’ve aced this practice test, check out another: https://driving-tests.org/wisconsin/wi-cdl-air-brake-practice-test/.

You can set yourself apart from much of the competition by adding valuable endorsements to your CDL with our Practice Tests: https://driving-tests.org/wisconsin/wi-cdl-hazmat-practice-test/. Also, consider preparing for the official combination exam here: https://driving-tests.org/wisconsin/wi-cdl-combination-test/.