E. LearndmvDMV PRACTICE
Find your state Exam types Practice tests Sign in Create account ↗
Practice quizzes / Illinois CDL Air Brakes Practice Questions - Illinois CDL Air Brakes Knowledge Test Exam / Question 99603
Practice question

What passing standard applies to CDL knowledge tests under 49 CFR 383.135?

  1. At least 80 percent correct
  2. Exactly 50 percent correct
  3. No missed questions allowed
  4. A road test only, with no knowledge score

Answer: A — At least 80 percent correct

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: Illinois CDL Air Brakes Practice Questions - Illinois CDL Air Brakes Knowledge Test Exam →
Learndmv.

Thoughtful practice for the road ahead. Find permit, road signs and CDL preparation by state.

Explore

Practice by stateAll practice testsExam types

Your account

My profilePractice historyAccount security

Get started

Create accountSign inSitemap
© 2026 LearndmvIndependent practice resource · Not affiliated with any state DMV.