I take my caliper off and open the bleed value a bit, attach a clear hose to it, then compress the piston. All the old stuff gets pushed out, then fill from the MC, slowly pumping the lever, with new fluid and the piston still compressed. Once I get nice clean fluid and making sure there are no air bubbles, I close the valve, remount the caliper and then do the other side. Once it's done, I make sure the brakes are nice and firm, top off the MC if needed, and take off on a long test ride. Many ways to do it and this is just the way I do.
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