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View All PlansFree Montana CDL Air Brakes Test 2025
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Based on 2025 MT commercial driver's license manual
- Triple-checked for accuracy
- Updated for August 2025
A CDL without an air brake restriction is essential for maximizing your job prospects, since most semi-trucks and tractor-trailers rely on air brakes. Failing to pass the Montana MVD CDL Air Brakes Knowledge Test results in an “L” restriction on your CDL, preventing you from operating vehicles equipped with air brakes. Failing the test also results in a one-day waiting period and a retest fee. Our Montana MVD CDL Air Brakes Practice Tests are designed to help you pass your knowledge exam on the first attempt.
From Montana’s rugged mountains to the frequent high winds and flooding on its plains, the terrain requires air brake-qualified drivers for heavy rigs. The deep snow and ice in winter compounds this need for a reliable air brake system. Major transportation routes in Montana include I-90 (a major freight corridor crossing the mountains), I-15 (a north-south route with steep inclines), I-94 (an eastern highway crucial for freight). The “L” restriction severely limits your driving options on these highways and the many jobs provided.
Industries across the Big Sky State that rely on drivers with the air brake qualification include agriculture, energy, mining, and tourism. Major companies requiring air brakes include CHS Inc. and RMA Energy in the agriculture sector and Montana Resources and ExxonMobil in the mining and energy sectors. XPO Logistics and UPS are major players in the freight and logistics industry that require air brake-qualified drivers. So do Greyhound Lines and Total Transportation in the tourism industry. Finally, school districts across the state use full-size air brake-equipped school buses, employing hundreds of qualified drivers. The “L” restriction makes operating CMVs equipped with air brakes illegal, eliminating the above-listed employment options.
The written Air Brakes knowledge test features multiple-choice questions based on the state’s CDL manual (Montana CDL Handbook 2025) and requires a minimum passing score of 80%. Our CDL Air Brakes Practice Tests cover all essential knowledge for the official MVD Air Brakes knowledge test. The information you learn will also help prepare you for your skills test, which includes inspecting components, testing for air pressure and leaks, and operating air brake-equipped vehicles.
Our Practice Tests are designed to resemble what you will face on the official test and offer real-time feedback on all responses. This scientifically proven approach improves material retention and ensures you’re prepared to pass the test.
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual MT MVD exam
questions
correct answers to pass
passing score
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Experience the Driving-Tests differenceList of questions (classic view)
- How would you check your truck's slack adjusters?
- Which of the following is NOT part of the air brake system?
- What is the best way to test your vehicle's low air pressure warning signal?
- Which of the following should you do before leaving your vehicle unattended?
- The tractor protection valve
- Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with an anti-lock braking system (ABS)?
- How do brakes work on a long, steep downgrade?
- When should you use the parking brake?
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- Which of the following is NOT part of the drum brake?
- The purpose of a supply pressure gauge is
- Slack adjusters are
- After the initial drop, the maximum acceptable leakage rates per minute are
- Under which conditions are front wheel brakes good?
- Which of the following are true about a dual air brake system?
- Spring brakes are
- Why must you pass a knowledge test on air brakes?
- When should you drain your air tanks?
- An anti-lock braking system (ABS)
- If the air tanks are not drained,
- At what measurement is the safety valve USUALLY set to open?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- Which of the following can cause brakes to fade or fail?
- Which vehicles must have low air pressure warning signals?
- Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
- The low air pressure warning signal will come on before the pressure in the air tanks falls below
- A low pressure warning signal is required on
- All vehicles equipped with air brakes have
- With air brake-equipped vehicles, the parking brakes should be used
- The use of air brakes on a downgrade is only a supplement to the