Air Brakes
25 original practice questions across 5 topics. Every answer comes with a written explanation and a citation to the actual federal regulation, not just an answer key.
Study by topic
Frequently asked questions
What does the Air Brakes CDL test cover?
The Air Brakes knowledge test covers 5 required topics, including Air Brake System Components, Dual Air Brake Systems, and Air Brake Warning and Control Devices. These are the required knowledge areas under 49 CFR 383.111(b). Practicing by topic here lets you see exactly which areas you're weak on before test day.
How many practice questions does the Air Brakes section have?
This section has 25 original practice questions across 5 topics, each with its own written explanation and a citation to the actual regulation behind it. Your state's real test uses its own question count; Washington, for example, uses 25 questions for its Air Brakes test.
Are these the real Air Brakes CDL test questions?
No. These are original practice questions, not the actual Air Brakes exam questions used by any state. They're derived from the federal knowledge requirements in 49 CFR 383.111(b), never copied from a real test or a competitor's practice test, and each comes with its own written explanation.
What happens if I skip the Air Brakes test?
If you don't pass the Air Brakes knowledge test, or you take your skills test in a vehicle without air brakes, 49 CFR 383.95 requires your state to place an air brake restriction on your CDL, blocking you from driving any vehicle equipped with air brakes. See our air brake restriction page for how to remove it later.