CDL (Commercial Driver)
CDL Air Brakes Practice Test 8
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
Inspecting air brakesAir brake system partsUsing air brakesDual air systems
Preview the first question
As air pressure rises during the inspection, what should happen to the warning alarms and emergency devices?
- They should flash until the brake pedal is pressed one more time
- They should turn off automatically at the proper pressure
- They should stay on until the engine is shut off
- They should only turn off by hand, using the reset switch on the dash
Answers are revealed on the results page after you finish.