CDL Air Brakes practice test

Required if the vehicle you'll drive has air brakes. Score under 80% and an air-brake restriction goes on your license. 25 questions, every answer explained. Free, no signup.

Drawn from a bank of 61 questions, weighted across every knowledge area. The selection changes daily, but this bank is only 2.4x the test length — so most questions will repeat on a retake. Air Brakes is a narrow subject and we would rather say that than pad the bank with reworded duplicates.

What this test covers

Federal law prescribes the knowledge areas a CDL applicant must be tested on. This bank is organized by them, and each practice test draws proportionally across all of them rather than sampling at random.

What's at stake

Failing this doesn't just mean a retake — a restriction is added to your CDL barring you from air-brake vehicles, which is most commercial trucks.

Common questions

How many questions are on the real Air Brakes test?

Test length is set by your state within the federal framework, so it varies — commonly around 50 for General Knowledge. What doesn't vary is the passing score: 80%, federally, everywhere. Confirm the question count with your state licensing agency.

Who has to take the Air Brakes test?

Anyone driving an air-brake vehicle.

Can I retake it if I fail?

Failing this doesn't just mean a retake — a restriction is added to your CDL barring you from air-brake vehicles, which is most commercial trucks. Most states allow retakes, often after a waiting period — check with yours.

Are these the real test questions?

No. The federal question pool isn't public, states develop their own wording from it, and versions rotate. These are original questions covering the same federally required knowledge areas — which is what the real test is built from too.

The rest of the battery

A CDL is several tests, not one. See the full battery and which ones apply to you.