gchappel

Car is an 85 carrera.
It has had a brake fluid leak over the last few months that I can not find. About 2 months ago she went to the shop for the leak and I was told the rear calipers were leaking and they were rebuilt. Now the brakes work fine. No brake leak at all on the street over weeks- but in a 2day DE event- and it was driven hard- I had great brakes on the track, but I lost 1/2 a reservoir of fluid!
No fluid around the master cylinder, none in the vacuum boost housing, none in the stowaway where the AC blower and hardlines live. None in the tunnel in the car. I don't see anything near the calibers- all clean and dry. I haven't pulled the pads yet, I probably should to see if they are wet- but I am looking for a lot of fluid. I have had the system under 15-20lb of pressure for 24 hours- hoping that would show something--nothing, dry as a bone.
Any ideas of where to look- I am about ready to randomly start replacing things.
Thanks, sorry about the length.
Gary