Iowa CDL Air Brakes Test

About the Air Brakes Test

Learn about air brake systems, operation, and safety procedures required for commercial vehicles.

Test Requirements

• Number of questions: 25
• Correct answers to pass: 20 out of 25
• Passing score: 80%
• Time limit: 30 minutes

Study Tips

• Understand air brake system components and functions
• Learn proper brake inspection procedures
• Know the difference between service, parking, and emergency brakes
• Study brake fade and proper braking techniques

What to Expect

This practice test simulates the actual Iowa CDL Air Brakes exam. Each question is multiple choice with four possible answers. You must score at least 20 out of 25 to pass.

The questions are based on the official Iowa CDL handbook and cover topics including:

• Federal Motor Carrier Safety Regulations (FMCSR)
• Iowa-specific CDL requirements
• Safe driving practices and procedures
• Vehicle operation and maintenance