I had the exact same problem on my 85.5 944 NA. Replaced the brake master cylinder and thought the problem was solved. Two days later I was leaking brake fluid on driver's side floorboard. Had to replace the clutch master cylinder as well. Problem solved. Some things to watch out for. The clutch fluid hose (the blue one) can develop a break easily so be careful. You'll have to cut the clip and replace with a standard screw hose clamp. The brake lines are a pain in the a** to align so be prepared for some time. Remove the diagnostics hookup (Brass looking circle with rubber boot) to give yourself some more room. Also get the power bleeder to save yourself some time bleeding the brakes (especially if you don't have any help). I would suggest purging the whole system to get some fresh break fluid in there. Mine looked like coke. Watch your level in the power bleeder though. If you don't have enough in, you will end up sucking air into the lines and have to start over. Hope this helps.
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