Just had the same problem with the rear brake on my 2000 1150, non servo abs. When slowing for a 30 limit after a 10 minute 60mph run the bike felt thick and sluggish rolling off the throttle... I felt it straight away but had no idea of the cause until I was slow enough to smell the burning.........
I pulled over and saw the smoke emanating from the rear calliper ( a whiff not a plume... just coppaslip burning off the rear of the pads ) and waited for all to cool down. Out with the tools and off with the calliper, cable tied it to the pillion hanger and carried on to work.
I popped by Steptoe on the way home for his thoughts, and have ordered a new braided hose and calliper pin from motor works. My bike has 95K + on it and this is probably the original rubber hose, so it's allowed to give up and die...
The front lines are already braided, so just ordered new calliper pins for them and will pick up some more brake fluid when the bits come and strip and clean all + run fresh fluid through.
I felt the back brake going sticky earlier in the week and gave the calliper a quick check and put a little fresh fluid through. All seemed ok, no bulging in the wall, the fluid passes through and comes out clean, but when ridden for a longer high speed blast the brake bound on as the delaminated hose became a one way tap.
Hopefully your problem is similar to mine, if yours has rubber hose + it's a 1999 bike....
edit - spelling!
