Look for any dampness around the master cylinder and booster, front and rear calipers, ABS control unit, and the hill holder if the car has it.
There could also be a leak at the proportioning valve which I think is somewhere along the rocker panel inside the car.
I believe I located the problem and fixed it. Very slightly loose banjo bolt on the front right caliper. It was not obviously damp, but comparison to the left side showed it was slightly darker in color with slightly more accumulated dust.
I realized that the fluid capillaried all over the housing, and most of it likely evaporated from the high heat generated by a caliper.
(How you like them apples... I used "capillaried" and "caliper" in the same sentence. May not be proper term. )
So I just tightened it a smidge, since it took only about 10 ft lbs (by feel). The hose was not damp at all, so I don't suspect the swedge. There's a copper crush washer on each side of the banjo, and I can't remember ever replacing the hose and it looks OEM. I don't wanna pull it all apart with my filthy hands and risk dirting the thing up. I sprayed it all with brake cleaner and will watch for the dampness to return.
Come to think of it I put KYB's on it a few years back and may have disconnected the hose at that point and replaced it as matter of course.
The through-body grommets are good and the lines ok. Easy to find the rear pass side one.
Edited by uniberp, 09 August 2013 - 10:20 AM.