ND CDL Air Brakes Practice Test 4 2025

An essential step in unlocking many job opportunities across North Dakota is removing the “L” restriction from your CDL. Passing the North Dakota DOT CDL Air Brakes Knowledge Test and the Skills Test in an air brake-equipped vehicle is necessary for this. With an “L” restriction, you cannot operate commercial motor vehicles (CMVs) equipped with air brakes, shutting you out of most trucking, large bus, and heavy-equipment jobs in the state. If you fail the knowledge test (or take the Skills Test in a vehicle not equipped with air brakes), the L restriction will remain, and a minimum one-day waiting period and retest fee will be required prior to a second test. Our North Dakota CDL Air Brakes Practice Tests are specifically designed to help you pass on the first attempt.

The Air Brakes Knowledge Test is based on the official Commercial Driver License (CDL) Manual, specifically Section 5: Air Brakes. You must score at least 80% on the multiple-choice test to pass. The Skills Test includes a pre-trip inspection (including the three-part air brake check) to remove the restriction. North Dakota requires drivers to perform an air leakage check, a low-air warning device check, and an automatic spring brake engagement check.

Our Air Brakes Practice Tests mirror the format of the official DOT exam, creating a comfort level for you before you even walk into the testing site. Our practice tests provide instant AI-driven feedback and explanations and repeat missed questions until you answer them correctly (through our state-of-the-art Challenge Bank). Our experts have meticulously removed any unnecessary fluff from your study materials, helping you focus on only the tested material. This system ensures you learn faster, retain more, and pass on your first attempt. Once you’ve aced this practice test, try another here: https://driving-tests.org/north-dakota/nd-cdl-air-brake-practice-test/.

Major roadways, including I-94, I-29, US-2, and US-83, are the backbone of the Peace Garden State’s infrastructure and help major industries (and the drivers that support them) flourish. These industries include agriculture and agribusiness, bus/passenger transport, education, oil and gas, and manufacturing and heavy equipment. Major employers include Bobcat, CHS, Inc., Harlow’s Bus & Truck Sales, Hess Corporation, Jefferson Lines, Marathon Oil, and school districts throughout the state. Without the air brake qualification, your job opportunities with these employers are extremely limited.

While you’re in this study mode, you should next consider adding valuable endorsements to your CDL. Prepare for the official knowledge tests here: https://driving-tests.org/north-dakota/nd-cdl-hazmat-practice-test/. Also, check out our Combination Vehicles Practice Tests to prepare for the official exam: https://driving-tests.org/north-dakota/nd-cdl-combination-test/.