So I replaced my master cylinder about a month ago, and finally through the help of this site was able to reverse bleed the system.

Unfortunately, I began losing clutch again, and reverse bled a couple of more times over the weeks before I installed a new slave cylinder.

I noticed my slave was clearly shot, so I figured this would end my problems forever. Wrong. Same problem.

I have followed every line and do not see a leak ANYWHERE.
I don't know what to do.
The good news is, I guess, that I can reverse bleed in my sleep, and it only takes me about 10 minutes start to finish.

I can't go on like this forever though.
PLEASE anyone with any knowledge of what might be the problem or even ideas help me!

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1967 W110 200D
1977 W123 240D (RIP)