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View All Plans- Updated for May 2025
- Based on 2025 HI commercial driver's license manual
Free Hawaii CDL Air Brakes Test 2025
Operating commercial motor vehicles (CMVs) with air brakes requires a specialized skill set. Our Hawaii DMV CDL Air Brakes Practice Tests are designed to help you pass your knowledge exam on the first attempt. If you don’t pass, your CDL will include the restriction “L,” preventing you from operating CMVs with air brakes. In Hawaii, where there are mountainous areas (Maui and the Big Island), winding roads (Hana Highway), and challenging tropical weather, the need for air brakes and drivers qualified to use them is critical. There are major coastal freight routes along the Queen Ka’ahumanu Highway (Big Island) as well as steep volcanic climbs on the Haleakala Highway (Maui) that require precise braking, not to mention the traffic congestion in tourism-heavy areas along the H-1, H-2, and H-3 freeways on Oahu. As most semi-trucks and tractor-trailers rely on air brakes, this qualification is essential for a driver’s overall job market success.
Industries across the Aloha State rely on drivers with the air brake qualification. Major companies requiring the air brakes qualification include Hawaiian Cement and Grace Pacific LLC. in the construction industry. The freight sector includes companies like Young Brothers and UPS, which hire a significant number of drivers with the air brakes qualification. So do charter bus companies like Roberts Hawaii and Polynesian Adventure Tours, public transit options offered by TheBus (Oahu), and school districts operating hundreds of Department of Education school buses. Passing the test to have the “L” restriction removed makes these jobs attainable.
Our practice tests help you pass your air brake knowledge test; however, the information you learn will also be useful as you practice to pass your skills test. The hands-on skills test includes inspecting components, testing for air pressure and leaks, and operating a vehicle equipped with air brakes. The written Air Brakes knowledge test features multiple-choice questions based on the official Hawaii CDL manual (Hawaii CDL Handbook 2025) and requires a score of at least 80% to pass.
Our CDL Air Brakes Practice Tests are designed to closely align with the official DMV knowledge test, mimicking the content and format you’ll encounter. Additionally, our practice test questions and answers provide responses in real time, a scientifically-backed approach for enhancing retention. You can learn quickly and be confident of passing your official exam.
- 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 HI DMV exam
questions
correct answers to pass
passing score
List of questions (classic view)
- Spring brakes are
- How would you check your truck's slack adjusters?
- An anti-lock braking system (ABS)
- 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)?
- Under which conditions are front wheel brakes good?
- At what measurement is the safety valve USUALLY set to open?
- Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
- The tractor protection valve
- Which of the following is NOT part of the air brake system?
- When should you drain your air tanks?
- After the initial drop, the maximum acceptable leakage rates per minute are
- What is the best way to test your vehicle's low air pressure warning signal?
- The purpose of a supply pressure gauge is
- Which of the following are true about a dual air brake system?
- If the air tanks are not drained,
- Which of the following should you do before leaving your vehicle unattended?
- Which of the following can cause brakes to fail or fade?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- Which vehicles must have low air pressure warning signals?
- How do brakes work on a long, steep downgrade?
- When should you use the parking brake?
- Why must you study air brakes in the state of Hawaii?
- Slack adjusters are
- 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 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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