CDL Prep: Air Brakes & Class A

Rexa

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About this app

NOT A GOVERNMENT AGENCY. CDL Practice Test is an independent study app, not affiliated with or endorsed by the FMCSA, AAMVA or any state driver licensing agency, and it cannot issue a CLP, a CDL or a test appointment. Picking your state does not change the questions: they come from the federal rules in 49 CFR. Every source is listed in full below.

Free CDL practice test built from the federal regulations - 49 CFR - and the 2026 AAMVA commercial driver manual. Three options per question and an 80% pass mark, like 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
• Combination Vehicles practice test - required for a Class A CDL
Class A, Class B and CLP applicants start here. A pass means you met the federal 80% mark in this app - not an official result.

WHAT IS FREE
30 practice questions a day, every explanation and source link, and the whole bank offline. No account needed. Watch a short ad to pass the limit, or subscribe to remove both.

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 names the part of 49 CFR it comes from.

CDL FLASHCARDS AND QUICK DRILLS
Quick drill turns CDL prep into a card deck: swipe left when you know it, right to save it - saved cards come back on a schedule until they stick.

REVIEW EVERY QUESTION YOU MISS
Missed questions go to your mistakes deck until you clear them. Accuracy by subject: general knowledge, air brakes, combination, cargo, inspection and rules.

CDL ROAD SIGNS TEST
84 official MUTCD road sign designs - regulatory, warning, guide, work zone and school - a flip-card deck with shape, color and code.

EXAMEN DE CDL EN ESPAÑOL
Full Spanish, not a machine translation - terminology follows the official Spanish edition of the New York manual (CDL-10S), listed below.

OFFICIAL SOURCES
This is the complete list: every rule, figure and road sign in the app comes from one of the 8 government publications below and from no other source. Picking a state in the app adds no source: the knowledge test is federal, so these same publications back all 50 states. The app carries this list under Settings > Official sources. Two state DMV servers refuse every connection that is not a desktop browser, so those two links open the Internet Archive's copy of the agency's own page:
• Full list with archived copies: https://hamzacakmakk.github.io/cdl-legal/sources.html
• CDL standards, the 80% pass mark, disqualifications - 49 CFR Part 383: https://www.ecfr.gov/current/title-49/part-383
• Driving: railroad crossings, speed, hazardous conditions - 49 CFR Part 392: https://www.ecfr.gov/current/title-49/part-392
• Brakes, low air pressure warning, coupling, cargo securement - 49 CFR Part 393: https://www.ecfr.gov/current/title-49/part-393
• Hours of service - 49 CFR Part 395: https://www.ecfr.gov/current/title-49/part-395
• Inspection, repair, maintenance and the inspection report - 49 CFR Part 396: https://www.ecfr.gov/current/title-49/part-396
• What the test covers - Commercial Driver's License Manual, AAMVA 2026 edition, Virginia DMV: https://web.archive.org/web/20260419120830/https://www.dmv.virginia.gov/licenses-ids/cdl/manual
• Test format and Spanish terminology - New York State Commercial Driver's Manual, CDL-10 and Spanish CDL-10S: https://dmv.ny.gov/driver-license/commercial-drivers/new-york-state-commercial-drivers-manual
• Road sign shapes, colors, codes and artwork - MUTCD 11th Edition: https://mutcd.fhwa.dot.gov/kno_11th_Edition.htm

This is not any state's own exam paper. Check the current text before your test.