brake fluid loss?

[Michael Stricker <stricker@ll.mit.edu>]

Hi,

I had to add some brake fluid to my 84 4kq a couple of days ago and 
noticed that the fluid level is down again.

I checked the hydraulic system for visible leaks (all four corners of the 
car, interior near the brake and clutch cylinder pistons, and around the 
brake master cylinder, brake vacuum servo, and clutch master and slave 
cylinders) and found everything to be DRY.  The brakes are very firm and 
the clutch is operating fine.

As far as I can tell, there can be only two other locations where the 
fluid is leaking and accumulating; 1. Inside the brake vacuum servo and 
2. inside the transmission bell housing (clutch slave cylinder).

Are these "guesses" reasonable?  Thanks for any insight.

Mike Stricker
1990 Quattro Coupe
1984 4kq (loosing brake fluid)