Clutch drag

[Grumpy Goat]

I think I’ve got to the bottom of the problem. When I operate the clutch with the reservoir cap removed I can see a fine emulsion being drawn into the reservoir when releasing the lever. I think the master cylinder needs replacing.

Are you thinking the fine emulsion could be suspended bubbles? How did you conclude that it was the master cylinder that needs to be replaced? Just asking since I never serviced a hydraulic clutch before.