Rear brake master cylinder
Cheers
Steve
On my first Harley, many years ago, I disconnected the rear caliper, to get it below the master cylinder and bleed the darned thing, because that was the only reliable way I could find to get good results! So my suggestion has a good precedent.
Hope that helps. When doing jobs like this it is well worth having the FSM by your side, as it provides helpful detailed instructions, drawings/photos, plus all the torque data you will need. A darned sight cheaper than getting a dealer to do the work!







