I have plenty of towels around on the bike when I do this. I also hold a rag around the line fitting and leave enough visible for me to see bubbles. If you go slowly the mess is not as bad as you think. The last time I did it, I made no mess bleeding, but the bike was on the jack. When I put the rags down the damn handlebar turned because I was not holding it, Fluid spashed everywhere because the lid was not on the master cylinder.
I learned to tie the wheel straight ahead!

 

I don't know the stock size; I was going to look it up but got really busy. I did reach out via chat to Brembo USA, we'll see what they say.

 

Well, Brembo told me, politely, to contact SpeedKings who I purchased from. I get it, but still, seems kind of shitty. I mean it really is a math question, what size bore master is optimal to drive my 8 x 30mm piston setup? I know it's not exactly that simple, but I'm not tracking the bike so there's room to fudge...would I be wasting my time getting a 15mm because it'd still be too small?

 

15mm is probably too small. Just a fyi, I'm not suggesting which way to go. I know you want to keep the stock look. When I upgraded my brakes I first went with a single disc setup. I used a caliper off a R6. I believe the piston sizes are 27/30. I use a Brembo 15rcs with it. When I went to dual disc I moved to the 19rcs. It's a very firm lever. I read somewhere the R6 uses a 16mm radial caliper with them but I don't know for sure.

 

Didn't you say you were already at 11/16"? That's a little more than 17mm.

When you go too big the usual problem is you loose feel because the brake goes from released to fully applied with a very small lever movement. It is often described as a "wooden" feel. It sounds to me like your problem is the opposite.

 

The 11/16" master will move about 1.5 times as much fluid as the 9/16" master. Assuming the two calipers you have now each need the same amount of fluid as the one you replaced, a 19mm master would be about right. 3/4" is about 19mm.

I recall someone posted a link to a site or two with calculations for this very problem. Not sure if it was here or somewhere else.

 

Great info, thanks! I do remember now that someone had posted here about the 19rcs with their dual Brembo's. I did some more searching it is the recommended master for dual radial Brembo's. What I read though referred to the travel as being 19mm and not the bore, seems like I may have been misspeaking? I see that Brembo does make a matching clutch perch and lever so maybe a switch might be in my future.

Doh!

I have a link to the chart in my first post, is that what you're thinking of?

 

Yeah, that's one of them.

I just re-read your first post. 8x30mm pistons means you have to think really big! Do you know what the setup was that you last felt was good?

 

Stock single front caliper with 9/16" master after I switched to braided line was the perfect feel for me.

 

Do you know what the piston config of the stock front caliper was?