CDL (Commercial Driver)
CDL Air Brakes Practice Test 11
Free — no payment neededPractice betaLevel: Mixed
20 original CDL Air Brakes questions based on the federal motor carrier safety rules (49 CFR). Practice test, not affiliated with any government agency. Practice beta.
Created by AI
Practice test, not affiliated with any government agency. Original questions written from public sources, checked by a second AI reviewer and automated checks. Rules change; confirm with the official handbook. Available in 2 languages (translations are machine-made and checked automatically).
Before you start
- Questions
- 20 multiple-choice questions, one at a time
- Time
- About 12 minutes. Untimed — take as long as you need.
- Pass mark
- 16 out of 20 correct (80%)
- Feedback
- Your score, the correct answers and short explanations when you finish
- Account
- Not needed. Your answers stay in this browser.
What this test covers
Air brake system partsInspecting air brakesUsing air brakesDual air systems
Preview the first question
What does the air compressor governor control?
- When the compressor pumps air into the tanks
- How hard the brakes apply at each wheel
- When the parking brake warning light comes on at the dash
- How fast the brake drums cool down
Answers are revealed on the results page after you finish.