Which statement best indicates brake fluid contamination?

• A. Dark or cloudy fluid, moisture present
• B. Clear amber fluid
• C. Fluid at correct DOT specification
• D. Fluid color matches brand

Answer: (A)

Brake fluid contamination shows up when the fluid looks dark or cloudy and moisture is present. Brake fluid is hygroscopic, so it absorbs water from the air over time. That water lowers the boiling point, increases the risk of vapor lock, and accelerates internal corrosion. A dark or milky appearance is a visual cue that the fluid has degraded and is contaminated. Clear amber fluid usually indicates cleaner fluid, and a fluid meeting DOT specifications speaks to overall properties but does not guarantee it’s free of moisture or particulates. Dye color variation by brand can vary, so color alone isn’t a reliable contamination indicator.