Bumping this up. My S4 came with a metal clutch slave cylinder, unknown brand, installed by a PO.
I had noticed what seemed to be brake or power steering fluid leaking but didn't think much of it, especially since the car often wasn't parked in my garage.
On the day I pulled the S4 into my garage, it didn't actually make it (lost clutch operation), and had to be pushed into the garage. BRAKE light was flashing and beeping, I learned because the fluid was low.
Found brake fluid leaking from the connection between line and slave, same as OP.
Took the slave off, removed the inlet connection fitting, and found out I could disassemble that fitting. Here's the seal in that fitting:
https://photos.app.goo.gl/SbiWnJ4MDvRyQkDe8
https://photos.app.goo.gl/1VFb3XBADxPkEwBu7
It appears to have "unrolled" or something; in any case that definitely caused my fluid leak.
https://photos.app.goo.gl/GDiz1URAAiKozPDr5
Took some measurements, and bought 2 sizes of O-rings to try as a replacement. This was the best fitting O-ring I found: size 009, material EPDM which is supposed to have excellent resistance to brake fluid.
https://photos.app.goo.gl/TGi6BwuhDY4114yz7
Plopped on a little thread sealant for good measure (not needed IMO based on the way the O-ring seals) and reassembled the fitting, then reinstalled back onto the slave cylinder:
https://photos.app.goo.gl/GDiz1URAAiKozPDr5
Early test fitting with this O-ring felt like it's a good size to suit the clutch line and fitting, with a bit of squeeze/friction.
For reference I found the fitting's bore is 8.8mm, and the clutch line shaft is 6.0mm. I used an imperial size O-ring, with "actual" dimensions of 0.208" (5.25mm) I.D. and 0.348" (8.84mm) O.D.
UPDATE: this didn't stop the leaking. I ended up replacing this garbage slave cylinder and the stock line to get rid of that stupid interface entirely:
https://www.audizine.com/forum/showt...9#post13127139
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