Originally Posted by
Bidja
Having no direct experience with your veh so info provided for thought.
All this brown like gunk in the housing that where you are supporting the push rod, is it moisture ingress mixing with brake fluid? If so, it appears your master cyl piston is gone or maybe it is some old grease / moisture mix . The rod wobbling around is more than likely behaving that way as it provides a means for it to allign for assy and operation.
Look, it is a bit hard to see bore condition but really it is probaly getting past it so might be easier and cheaper in the long run to buy that new master and slave cyl (trouble free for a while). What ever way you choose flush your lines with new fluid prior to hooking up to slave. Gunk and moisture is more than likely to be in the line.