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The color of brake fluid is a crucial indicator of its efficacy and the need for a hydraulic system flush. Typically, new brake fluid is clear to light amber, signaling that it is effective for pressure transfer within the braking system. As the fluid ages and absorbs moisture, it darkens to shades of brown and even black. A discernible shift to these darker hues generally indicates that the fluid’s moisture content has increased beyond the acceptable level, which is typically 3% or more for glycol-based fluids. This can lead to corrosion of components such as the master cylinder and brake calipers, emphasizing the importance of regular fluid checks. For a detailed guide on how to check your car’s brake fluid level and color, you can refer to How to Check Your Car’s Brake Fluid Level and Color (Step-by-Step).