All your missed questions are saved
automatically for extra practice.
It's a practice test that's automatically made up of all your missed questions. Once you finish this test, you’ll be able to revisit your Challenge Bank™ to practice and sharpen your skills.
View All PlansAdding difficult questions to Challenge Bank™ is an exclusive Premium feature. Unlock access to 650+ exam-like questions, a Pass Guarantee, personalized study plans, and more.
View All PlansThe Exam Simulator mimics the actual exam. It will stop once you reach the maximum number of allowed mistakes.
To operate vehicles equipped with air brakes in California, you must pass both the Air Brakes knowledge test and a skills test in a vehicle equipped with air brakes. If you are unfamiliar with this process, we recommend studying the official CDL manual (California CDL Handbook 2025). Use this handbook as your primary reference throughout your learning phase. Read it multiple times to ensure a deeper understanding of its content. All 25 questions on the air brakes knowledge test are based on this manual, which is an essential resource issued by the California Department of Motor Vehicles (DMV).
But how can you be sure that you have fully understood the material? Many aspiring commercial drivers only discover their level of preparedness at the DMV location when they take the knowledge test. Instead of relying on luck, you can use our California CDL Air Brakes practice tests to evaluate your knowledge. Each practice test consists of 25 questions and is designed to closely reflect the official written exam. To pass, you’ll need to score at least 80%, but it is entirely normal to fail during your first few attempts. Our practice tests also serve as a valuable educational resource for beginners, and there are several features designed to help you master the subject.
Immediate feedback is provided after each question, including a detailed explanation attached to the correct answer. This feature allows you to identify mistakes and memorize the correct answer before proceeding to the next question. With unlimited attempts available, there is no need to rush your training sessions. With enough preparation, the test day will find you confident that you can pass the knowledge exam.
Don’t let any negative emotions overwhelm you. Use your time wisely, read each question carefully, and think twice before selecting an answer. You may be surprised how many students know the correct answer to a question but end up selecting a different one! Our CDL Air Brakes practice tests not only help you understand how to safely operate vehicles equipped with air brakes but also familiarize you with the content and format of the official knowledge test.
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Last verified for accuracy: November 2025 (reviewed weekly)
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Our trademarked system automatically saves questions you miss, creating personalized tests that target your weak spots until you’ve mastered the material.
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The Exam Simulator mimics the actual exam. It will stop once you reach the maximum number of allowed mistakes.
