Use brake fluid test strips or a pen tester to measure brake fluid quality, condition and color. Old or contaminated brake ...

This leads to contamination. The most important ... Take it to an auto mechanic to replace your brake fluid if the strip's color falls in the “required service” category.

Over time, brake fluid becomes contaminated with atmospheric dirt and abrasive metal wear particles from moving parts in the brake cylinders and calipers. Brake fluid also absorbs moisture from ...