- Updated for March 2025
- Based on 2025 UT commercial driver's license manual
Free Utah CDL Air Brakes Test 2025
Do you want to operate commercial motor vehicles (CMVs) with air brakes? Our Utah DMV CDL Air Brakes Practice Tests are designed to help you pass the DMV Air Brakes knowledge exam on your first attempt. Failing the Air Brakes knowledge test in Utah results in a one-day waiting period and a retest fee. Until you pass, your CDL will include the restriction “L,” preventing you from operating CMVs with air brakes. Utah is notable for its diverse terrain (and harsh winters), from the steep grades, winding roads, and high altitudes of the Rocky Mountains and Wasatch Range to the deserts and flat plains in western Utah. Here, reliable air brake systems are a necessity for heavy CMVs.
Utah’s major routes include I-15 (running north-south, connecting to Idaho, Nevada, and Arizona), I-70 (running through central Utah), I-80 (running east-west, connecting to California and the East Coast), and US-40 (linking rural areas to national highways). Most semi-trucks and tractor-trailers rely on air brakes. Therefore, with restriction “L,” your job opportunities will be significantly limited.
Industries across the Beehive State rely on drivers with the air brake qualification. These include manufacturing, energy, agriculture, and tourism. Major companies requiring the qualification include Cummins (Salt Lake City) and Northrop Grumman (Ogden) in the manufacturing sector and Chevron and Rocky Mountain Power in the energy industry. In the agriculture sector, Suncrest Farms and Utah Produce Co. are major players requiring air brake-qualified drivers. XPO Logistics, FedEx Freight, and UPS require the same in the logistics and freight industry. In the tourism and charter bus industry, Greyhound Lines and Utah Transit Authority require air brake-qualified drivers. Most Utah full-size school buses also have air brakes, employing hundreds of qualified drivers. Having an “L” restriction on your CDL prevents you from performing these jobs.
Our CDL Air Brakes Practice Tests help you pass your official DMV Air Brakes Knowledge Test and are useful as you practice for your skills test. The official written Air Brakes knowledge test consists of multiple-choice questions based on the state’s CDL manual (Utah CDL Handbook 2025) and requires a minimum passing score of 80%.
Our Practice Tests are designed to mimic the official knowledge test and offer real-time feedback on all responses. This enhances retention, reinforces key concepts, and ensures you pass the test on your first attempt.
- 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 UT DMV exam
questions
correct answers to pass
passing score
List of questions (classic view)
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- If the air tanks are not drained,
- Spring brakes are
- Which of the following are true about a dual air brake system?
- Which of the following is NOT part of the drum brake?
- Why must you pass a knowledge test on air brakes?
- Slack adjusters are
- At what measurement is the safety valve USUALLY set to open?
- How would you check your truck's slack adjusters?
- What is the best way to test your vehicle's low air pressure warning signal?
- After the initial drop, the maximum acceptable leakage rates per minute are
- What is the best way to test if your vehicle's spring brakes come on automatically?
- An antilock braking system (ABS)
- Which of the following can cause brakes to fade or fail?
- Under which conditions are front wheel brakes good?
- When should you drain your air tanks?
- Which vehicles must have low air pressure warning signals?
- The purpose of a supply pressure gauge is
- Which of the following is NOT part of the braking process when you're driving a tractor-trailer combination vehicle with an antilock braking system (ABS)?
- When should you use the parking brake?
- Which of the following is NOT part of the air brake system?
- Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
- The tractor protection valve
- Which of the following should you do before leaving your vehicle unattended?
- How do brakes work on a long, steep downgrade?
- 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
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We leverage feedback from our vast community of users to understand which topics are most frequently tested. This helps us focus on the areas that are most relevant and beneficial for your preparation. - Expert Content Creation:
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