Illinois CDL Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the Illinois CDL Exam. Utilize our comprehensive quiz featuring flashcards and multiple choice questions. Enhance your understanding and readiness for the exam with detailed explanations. Ace your CDL test and start your career in commercial driving!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the primary function of the parking brake within an air brake system?

To engage the service brake
To operate the emergency brake
To assist in normal driving
To secure the vehicle during parking

The correct answer is: To secure the vehicle during parking

The primary function of the parking brake within an air brake system is to secure the vehicle during parking. This brake is independent of the service brake and is designed to hold the vehicle stationary when parked or stopped. It is crucial for ensuring the safety of the vehicle and its surroundings while it is not in motion. Options A, B, and C are incorrect because they do not accurately describe the main purpose of the parking brake in an air brake system.