- 0 Incorrect (6 allowed to pass)
- 0 Correct
- Updated for February 2025
- Based on 2025 IN commercial driver's license manual
Free Indiana CDL Air Brakes Test 2025
Removing the air brake restriction from your CDL is vital for expanded job opportunities in Indiana because most semi-trucks and tractor-trailers rely on air brakes for safe navigation. Without passing the Indiana BMV CDL Air Brakes Knowledge Test, your CDL will include the restriction “L,” preventing you from operating commercial motor vehicles (CMVs) with air brakes. You will see shortly that this “L” restriction can significantly damage your job prospects in this market. Failing the air brakes test in Indiana results in a one-day waiting period and a retest fee should you decide to retake the test. Our Indiana BMV CDL Air Brakes Practice Tests ensure you pass your knowledge exam on the first attempt.
From the flat plains in the north and central parts of the state to the rolling hills in the south, hauling cargo across Indiana demands the use of air brakes. Additionally, the state’s icy winters require the reliable stopping power of air brakes. Major urban areas (like Indianapolis) and the key transportation routes, including I-65 (north-south freight corridor), I-70 (high-traffic east-west route), and I-69 (vital freight corridor), require air brake-qualified drivers. Let’s look at some of the jobs you lose access to by not testing to have the restriction “L” removed.
The Hoosier State relies on drivers with the air brake qualification in key industries, including manufacturing, agriculture, and logistics (Amazon and Walmart distribution hubs). Other major companies requiring this qualification include Old Dominion Freight Line, Knight Transportation, FedEx, and UPS in the logistics industry, as well as IndyGo and Miller Transportation (Indianapolis) in the public transit and charter bus industries. Indiana also has thousands of full-size school buses that require air brake-qualified drivers. The “L” restriction makes the above-listed jobs unattainable.
The written Air Brakes knowledge test features multiple-choice questions based on the state’s CDL manual (Indiana CDL Handbook 2025) and requires a score of at least 80% to pass. Have no fear! Our CDL Air Brakes Practice Tests cover all essential knowledge for the official BMV Air Brakes Knowledge Test. As a bonus, the information you learn will also be useful as you prepare to pass your skills test.
Our practice tests feature immediate feedback on all responses and mimic the official knowledge test. This two-pronged, scientifically proven approach helps you learn faster and ensures you pass the knowledge 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 IN BMV exam
questions
correct answers to pass
passing score
List of questions (classic view)
- How would you check your truck's slack adjusters?
- At what measurement is the safety valve USUALLY set to open?
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- How do brakes work on a long, steep downgrade?
- Slack adjusters are
- Spring brakes are
- After the initial drop, the maximum acceptable leakage rates per minute are
- The purpose of a supply pressure gauge is
- The tractor protection valve
- What is the best way to test if your vehicle's spring brakes come on automatically?
- What is the best way to test your vehicle's low air pressure warning signal?
- When should you drain your air tanks?
- When should you use the parking brake?
- Under which conditions are front wheel brakes good?
- Which of the following can cause brakes to fail or fade?
- If the air tanks are not drained,
- Which of the following is NOT part of the air brake system?
- 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)?
- Which of the following is NOT part of the drum brake?
- Which of the following are true about a dual air brake system?
- Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
- Which of the following should you do before leaving your vehicle unattended?
- Which vehicles must have low air pressure warning signals?
- An anti-lock braking system (ABS)
- Why must you study air brakes in the state of Indiana?
- 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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