CDL knowledge

Free California CDL practice test

Start free with General Knowledge. Unlock Air Brakes, Combination Vehicles, and the rest of the CDL lab for $9.99 for 30 days on this device. Original items modeled on the public California Commercial Driver Handbook — not official DMV questions. Paying here does not pass you and does not skip the DMV.

Who it is for: permit students and commercial-driver applicants. What it covers: handbook-based knowledge practice, including air brakes fundamentals and combination vehicles.

Start the CDL knowledge lab

Topic quizzes: General Knowledge · Air Brakes · Combination Vehicles

Educational-use notice: This material is for general educational and study purposes only. It is not official DMV or licensing training. It does not provide a license or guarantee of passing. Verify current requirements with the California DMV. Full disclaimer · See an error? Tell us.

Common questions

Are these official DMV questions?

No. Original handbook-style practice. Only the California DMV issues a CDL and administers the official tests.

What should I study first?

Start with General Knowledge (free). Air Brakes, Combination, and the rest of the lab are $9.99 for 30 days via Cash App, Bitcoin, or USDT.

Official source

California Commercial Driver Handbook · California CDL information. Last reviewed: August 31, 2026.

Unlock the full labs — $9.99