Automotive Service Excellence (ASE) Brakes Certification Practice Exam 2025 - Free ASE Brakes Practice Questions and Study Guide

Moisture in brake fluid significantly impacts braking performance primarily by leading to brake fade and corrosion. When moisture enters the brake fluid, it can lower the fluid's boiling point. This is critical because brake fluid operates under high temperatures generated during braking. As the temperature of the brake fluid increases, the presence of moisture can cause the fluid to boil, leading to the formation of vapor bubbles. This phenomenon is known as brake fade, where the bite of the brakes diminishes, resulting in a loss of effective braking force.

Additionally, moisture can cause corrosion within the brake system components. Brake fluid is hygroscopic, meaning it absorbs moisture from the environment. Over time, the accumulated moisture can lead to rust and degradation of metal parts such as brake lines, calipers, and master cylinders. This corrosion can further compromise braking performance and lead to potential failures in the braking system, making regular inspection and replacement of brake fluid essential for maintaining optimal braking efficiency and safety.