What effect does moisture content have on brake fluid?

Moisture content in brake fluid significantly impacts the performance of the braking system. When brake fluid absorbs moisture, it lowers the boiling point of the fluid. Brake fluid needs to withstand high temperatures generated during braking without boiling. If moisture is present, the boiling point decreases, which can result in vaporization of the brake fluid under heavy use, leading to brake fading. This phenomenon occurs because vaporized fluid is incompressible, compromising the system's hydraulic pressure and, consequently, its effectiveness in applying the brakes.

In addition to brake fading, moisture can lead to corrosion within the brake system components, as water can cause rust and degrade seals, leading to leaks over time. Regular maintenance and periodic replacement of brake fluid are essential to mitigate these effects, ensuring safe and effective braking performance.