Getting ready for a sport touring trip with my favorite riding buddy from NJ and just had to have a better master cylinder. The axial one works fine but feels more like an on-off switch. I've not had any of the sticking caliper pistons issues I've read others have had. As a precaution I lubed the pistons with Sil-Glyde (pic below) and I like the higher temp brade fluids where I use Motul RBF 600 (also below).
Next pic shows the Brembo RCS 17 (18-20). It comes with the brake switch. I soldered sleeved mine in instead of using connectors. Stock was 16mm master cylinder. I'm looking for better feel and modulation. Set on 18mm travel, it comes back too far for 2-fingers, so I'm starting out somewhere around 19-20mm setting.
Next pic is all finished. I used a Brembo mount and reservoir which I had to tweak (bend) to get right were I wanted it. I also reused the original master cylinder clamp the mirror screws into (reverse threads here for the mirror stalk, beware).
Next 2 pics are from the cockpit. You see a silver bar just below the handlebars, that's the axial to radial adapter that allows you to use the stock brake lines (still has to stretch a little). Last pic is a closeup of this. Vacuum pump bleed, clear Tygon tubing, saftety wire, etc. and it's done. You do need to also bleed at the master cylinder, not just the calipers. Ty-wrapped brake lever back to grip over night. Feels better, now I need to ride it.
UPDATE: did a crest ride with a friend today and I love this master cylinder, really, now brake modulation is easy and feels good. It does like to be adjusted out further between 19-20mm, forget the 18mm setting. I've read some using the RCS 19, but I would say this RCS 17 feels like the sweet spot on these calipers.