My previous bike was a R1150RT.
I noticed the rear disk was starting to darken in color due to heat, it was like you mentioned (possible to touch without screaming but not something I would choose to do)
I replaced the rear brakes thinking there was an issue with pads,pistons & dirt. I was wrong, it was the start of the final drive giving up...about 3 days later the oil seal gave out & dumped the diff oil all over the wheel & road on the way home...had to buy a new diff....BM's do have diff issues & rear seal issues...pay close attention to this issue.
The reason the disk was heating up was the rear wheel bearing cage was coming apart, there was slight play in the rear wheel causing simptoms like breaks binding, the bearing cage then trashes the oilseal and oil dumps out big time.
I would do a diff oil change and look for metal filings, also check for wheel play while the bike is on centre stand try rocking wheel from side to side
Last edited by Greg1863; Sep 5th, 2008 at 3:04 pm.