I too have a weird brake fluid loss problem. Mine happens every time I go to visit my parents for thanksgiving in Tennessee. For the last 2 years when I get into the Knoxville area I start smelling brake fluid. And sure enough it is in my left front wheelwell area and on top of the inner fender. I can never definatively tell where it is coming from. It almost looks like it is coming from under the metal block that has all the lines running to it which is located under the master cylinder. I top it off while there and intend to take it to the dealer when I get back home, then it stops leaking as mysteriously as it started. I know it is more hilly in Tn. and also a higher altitude. but for a year it does not leak until it gets back into Tn. maybe it is just alergic to Tn.