NM CDL Air Brakes Practice Test 4 2025

Passing the New Mexico MVD CDL Air Brakes Knowledge Test and the Skills Test (in an air brake-equipped vehicle) is essential if you want a Commercial Driver’s License (CDL) without the “L” air-brake restriction. The “L” restriction eliminates many of the best-paying commercial driving jobs across the Land of Enchantment. If you fail either test, the “L” restriction will remain on your CDL, preventing you from operating any vehicle equipped with air brakes, including most tractor-trailers, semis, heavy buses, fuel haulers, and commercial construction vehicles (CMVs). You’ll also have to wait the state’s minimum required period and pay a retest fee, further slowing your progress.

The written Air Brakes Knowledge Test requires a passing score of 80% and covers material like air brake system components, dual-air systems, proper braking techniques, system monitoring, air loss, leak-down tests, safety-device requirements, and emergency braking procedures. That’s a lot of material. Our New Mexico CDL Air Brakes Practice Tests provide a science-backed suite of tools that help you master the material and pass on your first attempt. Also provided is immediate AI-driven feedback, an interactive CDL Manual, and a Knowledge Bank that presents missed questions again and again until you master them. Once you have aced this practice test, try another one here: https://driving-tests.org/new-mexico/nm-cdl-air-brake-practice-test/.

New Mexico’s mountain passes in the Sangre de Cristo and Sacramento Mountains, high-wind plateaus across the high desert, and I-40 from Gallup to Albuquerque (notorious for rollovers) present a host of hazards that make air brakes a necessity for many vehicles. I-40, I-25, US-550, US-70, and US-285 demand reliable braking performance and are a vital part of the state’s infrastructure, supporting major industries and employers constantly in need of air brake-qualified drivers. These industries include agriculture and livestock transport, federal, military, and research institutions, mining (copper, potash, and rare earth minerals), oil and natural gas, and tourism and charter bus transportation. Major employers across these sectors routinely require air-brake certification for their commercial drivers, making the removal of the “L” restriction a direct path to more (and often better-paying) work.

While you’re on a roll with these practice tests, you should consider adding valuable endorsements to your CDL, such as (N) Tanker, (H) Hazardous Materials, and (T) Doubles/Triples. We have Practice Tests for this as well: https://driving-tests.org/new-mexico/nm-cdl-hazmat-practice-test/. Also, to prepare for the official combination exam, check out our Combination Vehicles Practice Tests: https://driving-tests.org/new-mexico/nm-cdl-combination-test/.