Originally Posted by CaliKarl
Could the master cylinder bleed possibly be a size M6x1?
I don't think so. I poked around until I found a schematic of the ABS-equipped master cylinder (on an F800GS), and the listing was M5 X 1. I was able to put a caliper on the threads of the fitting on my bike, and it was a scosche smaller than 5mm.