Hi, My friend has a Mk4 with a TKX trans with a Mcleod 1400 throwout bearing and Wilwood master with remote external reservior.

Has anyone had this issue:

Worked fine for 6 months after install, then one day the pedal noticeably lost back pressure with about a dozen full presses of the pedal. Went to the floor and won't disengage the clutch. No leaks anywhere.
Power flushed and bled the system. Seemed to work ok for a few months.
Now the pedal hits floor after gradually losing back pressure with 10 to 20 pushes. Again, no leaks.
Bled the system again. Same problem.

Back pressure seems to come back after just pushing the pedal just an inch or so a few dozen times very quickly. Back pressure comes back after half a minute, it works for a few full presses then bottoms out again.
We've bled the system, No bubbles. No leaks. Back pressure still disappears after a few pedal presses.

Short of taking off the body and pulling it all out, has anybody had this happen?