- Updated for January 2025
- Based on 2025 TX commercial driver's license manual
Free Texas CDL Air Brakes Test 2025
Texas is a huge state, filled with different heavy machinery needs and different types of trucking companies. At some point in your career, you doubt, you will either want or need to drive a vehicle with air brakes. Being prepared is just the smart thing to do, so take the CDL air brake exam now. The quickest path to successfully passing the exam is careful study, and practice tests. This practice tests features 30 multiple-choice questions that were written with information directly from the Texas Commercial Motor Vehicle Driver’s Handbook, and it features topics that are highlighted by the manual’s writers as most likely to be featured on your exam. By taking this practice tests as often as necessary until you are comfortable, and reading each question’s explanation so you fully understand each subject, you will soon be ready to handle the real CDL air brakes exam with ease. Good luck on this practice exam, and on your future CDL air brakes 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 TX DMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- What is the best way to test if your vehicle's spring brakes come on automatically?
- How do brakes work on a long, steep downgrade?
- At what measurement is the safety valve USUALLY set to open?
- The purpose of a supply pressure gauge is
- Slack adjusters are
- Which of the following should you do before leaving your vehicle unattended?
- Under which conditions are front wheel brakes good?
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- After the initial drop, the maximum acceptable leakage rates per minute are
- Which of the following is NOT part of the air brake system?
- How would you check your truck's slack adjusters?
- Which of the following can cause brakes to fade or fail?
- An antilock braking system (ABS)
- Spring brakes are
- Which of the following is NOT part of the drum brake?
- When should you drain your air tanks?
- When should you use the parking brake?
- The tractor protection valve
- Why must you pass a knowledge test on air brakes?
- 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)?
- Which of the following are true about a dual air brake system?
- Which vehicles must have low air pressure warning signals?
- What is the best way to test your vehicle's low air pressure warning signal?
- If the air tanks are not drained,
- Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
- 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
- You are on a steep downgrade and have reached your safe speed of 40 mph. You would apply the service brakes until your speed drops to
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