Udi and Woo... I've read and re-read the later part of this thread, but I'm still not sure I've captured the essence of the problem with the XTs. I have XT on my trail bike, and for the life of me can't get a good bleed on the rear brake. I've tried many times, even taken the entire brake-line-caliper assembly and hung in vertically (or rather I had the shop do it...) to get the bleed right. It seems to be good for a day or two, then it's back to the same problem which is: inconsistent bite point (though never a total loss of power) and loss of power (I can't even do a skid on snow). Am I right in assuming it's an issue with the seals at the caliper? Could I just buy a new caliper and stick it on there?