Below is a picture of rear brake fluid with 12k of use. The Wing came in for a 12,000 mile service with about 12k on the ODM. Notice the "crud" in the bottom of the reservoir ... it's really assembly lube and nothing to worry about. If its wiped out, and the brake fluid changed again at 24k, more will probably be found. After that, there should be very little residual left. Note how clear the fluid is.
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