CDL Prep: Air Brakes & Class A

Free CDL practice test built from the federal regulations themselves - 49 CFR - and the 2026 AAMVA commercial driver manual your state's test comes from. Three options per question and an 80% pass mark, the same as the real exam.

CDL PRACTICE TESTS FOR EVERY KNOWLEDGE TEST
• General Knowledge practice test - taken by every CDL applicant
• Air Brakes practice test - required for any vehicle with air brakes, and the test most applicants fail first
• Combination Vehicles practice test - required for a Class A CDL
Class A, Class B and commercial learner's permit (CLP) applicants all start here. When the result screen says you passed, it means you met the federal pass mark in this app - not an official result.

WHAT IS FREE
30 practice questions a day, every explanation and source link, and the whole question bank offline. No account, no sign-up. Watch a short ad to pass the daily limit, or subscribe to remove the limit and the ads.

A CDL STUDY GUIDE THAT EXPLAINS WHY
Every question tells you WHY the right answer is right, and names the wrong belief the other options are built on. You learn the rule, not an answer key.

WRITTEN FROM THE REGULATION, NOT ANOTHER CDL APP
Stopping distance, low air pressure warnings, cargo securement minimums, disqualification periods - each answer is traced to the part of 49 CFR that sets the rule. The links are below.

CDL FLASHCARDS AND QUICK DRILLS
Quick drill turns your CDL prep into a card deck. Swipe left when you know it, right to save it - saved cards return on a spaced schedule until they stick. A 60-second timed drill adds pressure, like the real CDL test.

REVIEW EVERY QUESTION YOU MISS
Missed questions land in your mistakes deck until you clear them. See your accuracy by subject - general knowledge, air brakes, combination vehicles, cargo securement, vehicle inspection and CDL rules.

CDL ROAD SIGNS TEST
84 official MUTCD road sign designs - regulatory, warning, guide, work zone and school - as a flip-card deck. Shape, color and official code, the way the test asks.

A DAILY CDL STUDY PLAN
A short session ready when you open the app, missed questions on a spaced schedule, streaks and optional reminders.

EXAMEN DE CDL EN ESPAÑOL
Full Spanish, not a machine translation - the terminology follows the official Spanish edition of the New York commercial driver manual. Study in the language you think in.

WHO IT IS FOR
• First-time CDL applicants going for a Class A or Class B license
• Drivers studying for the air brakes or combination vehicles test
• CLP holders preparing for the commercial learner's permit test
• Anyone retaking a CDL knowledge test they did not pass


OFFICIAL SOURCES
All regulatory information in this app comes from these government publications:
• 49 CFR Part 383, CDL standards and disqualifications: https://www.ecfr.gov/current/title-49/part-383
• 49 CFR Part 392, driving of commercial motor vehicles: https://www.ecfr.gov/current/title-49/part-392
• 49 CFR Part 393, brakes, coupling and cargo securement: https://www.ecfr.gov/current/title-49/part-393
• 49 CFR Part 395, hours of service: https://www.ecfr.gov/current/title-49/part-395
• 49 CFR Part 396, inspection, repair and maintenance: https://www.ecfr.gov/current/title-49/part-396
• Commercial Driver's License Manual (Virginia DMV edition): https://www.dmv.virginia.gov/sites/default/files/forms/dmv60a.pdf
• New York State Commercial Driver's Manual: https://dmv.ny.gov/driver-license/commercial-drivers/new-york-state-commercial-drivers-manual

CDL Practice Test is an independent study app. It does not represent a government agency and is not affiliated with or endorsed by the FMCSA, AAMVA, or any state driver licensing agency. Always confirm current rules with the official regulations and your state's commercial driver manual before your test.

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