Hi all,
Got same problem here as well. '03 X5 w/100009 on the clock. I've been having this problem since 70K or so. I had the fluid changed at 80K with no luck in resolving the problem. I've read that changing the solenoid (TCC) will fix this problem. I'm actually dropping my truck off to my service tech next week for a new set of rear brakes and He's going to investigate, I'll update with any new news.