Bounty, you are right if the seals were worn it doesn't take many stops to repeat the problem of no brakes. Have you flushed the brake fluid lately, i'm really reaching, but if a particle of crud managed to get next to the seal you would have your problem. On some of the less properly maintained cars i have worked on an amazing amount of junk comes out of the lines when the fluid is flushed.

While we are on the subject, a dragging parking brake or a long downhill run with the brakes applied will cause the brakes to fail when the brake fluid starts to boil. And this didn't happen to your brakes Bountyhunter. If you find out what the problem is be sure you post it, i would like to know.