- Updated for January 2025
- Based on 2025 PA commercial driver's license manual
Free Pennsylvania CDL Air Brakes Test 2025
In order to drive vehicles with air brakes in the state of Pennsylvania, you must pass thte air brakes section of the Pennsylvania CDL exam. Practice makes perfect, which is where this exam comes in: this 30-question practice test is written with information drawn directly from the Pennsylvania Commercial Driver’s Manual, and highlights topics that the manual writers stated you must know in the section on air brakes. Each queston has a hint and explanation, which you should pay close attention to, as the explanations provide further insight on each subject so you will be able to answer future questions correctly. Good luck both now on the practice exam which you can take as many times as you need to feel comfortable, and in the future, on the real 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 PA DOT exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- After the initial drop, the maximum acceptable leakage rates per minute are
- Which of the following should you do before leaving your vehicle unattended?
- Which of the following is NOT part of the air brake system?
- At what measurement is the safety valve USUALLY set to open?
- Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- Which of the following can cause brakes to fade or fail?
- If the air tanks are not drained,
- Which of the following are true about a dual air brake system?
- Spring brakes are
- Slack adjusters are
- The purpose of a supply pressure gauge is
- Under which conditions are front wheel brakes good?
- What is the best way to test your vehicle's low air pressure warning signal?
- How would you check your truck's slack adjusters?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- An antilock braking system (ABS)
- Which vehicles must have low air pressure warning signals?
- The tractor protection valve
- When should you use the parking brake?
- Which of the following is NOT part of the drum brake?
- 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)?
- How do brakes work on a long, steep downgrade?
- When should you drain your air tanks?
- Why must you pass a knowledge test on air brakes?
- 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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