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CDL Air Brakes Practice Test

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For the Real Air Brakes CDL Written Test:

  • How Many Questions:25
  • How Many Correct Answers to Pass:20
  • Passing Score:80%

CDL Air Brakes Practice Test Instructions:

Select number of practice questions:

  • Choose the best answer and receive instant feedback.
  • Click next to go to the next question.
  • Check your results at the end.
  • Start a new version and keep studying!


Each test contains questions based on information in the official CDL handbook for 2024.

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Your Results!

Your Total Score:

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What is the CDL Air Brakes Written Test?

  • Number of Questions: 25
  • Passing Score: 80%
  • Format: Multiple Choice & True/False

The Air Brakes knowledge test covers information about the parts of air brake systems and using air brakes on a commercial vehicle.

The air brakes test is based on the Air Brakes section (Section 5) of the CDL Manual.

How many questions are on the air brakes test?

This written test will consist of 25 multiple choice and true/false questions. You’ll need a score of 80% to pass (20 correct answers).

To fully lift the Air Brakes restriction on your CDL, you’ll also need to complete a skills test in a commercial vehicle equipped with air brakes.

Is the air brakes test hard?

Like all CDL knowledge tests, the air brakes test is more difficult when compared to the written tests for standard driver’s license.

If you take the time to study, you’re sure to pass.

You can prepare for the Air Brakes test by studying the appropriate section of the CDL Manual, taking some free practice tests, and learning about air brakes systems from a qualified instructor.

Who needs the Air Brakes Endorsement?

If you want to operate a commercial vehicle with air brakes, you’ll need to pass the air brakes test as one of the steps to earn the endorsement.

The Air Brakes written test is part of the requirement for any CDL driver who wants to operate a commercial vehicle equipped with an air brakes system.

The combination of the air brake written and skills test will demonstrate that you:

  • Know the components and functions of an air brake system.
  • Know how to properly identify components and controls of the air brake system.
  • Know how to safely and effectively utilize an air brake system.
  • Know how to identify, troubleshoot, and fix problems in an air brake system.

How to Use this Free CDL Practice Test

Each free practice test includes 15 multiple-choice questions based on the CDL manual. You can take the test as many times as you want.

Each time you take the test, you will receive a new set of 15 questions. The questions are generated randomly, so you can be sure that you are practicing a wide range of topics.

Before you know it, you will be ready to pass your written test and get your Commercial Learner’s Permit!

Get some more practice with the CDL Air Brakes Exam Simulation.