Are you sure its your Brake fluid and not Clutch fluid resevior (similar to brake fluid) I assume you have a Manual trans? ...If so that is likely clutch wear particles due to the hydrolic system, its a common problem with the C5 and C6 you can watch youtube vids on how to flush properly, if it is clutch fluid then you will want to flush on a regular basis to avoid your clutch pedal from sticking
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