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Discussion Starter #1
Finally fed up with the shock of swapping bikes from the Ducati with that insane system, my other bikes are terrifying. So rode a Griso with nothing but the stock P4.30 axial calipers and an RCS 19 and its insane how much difference just a $350 MC kit (banjo, mirror mount and reservoir inc) makes.

I see a 17/19. Anyone research and compare the difference on those older calipers? Idiots guess would be that the 19mm is going to be most aggressive, or more of a fit for a caliper with a larger volume, etc. Wondering if the 17 would be more ideal for a canyon carver/street machine given the small calipers or just go 19. I dont really need to get the back wheel off of the ground with one finger, just want better feel and leverage.
 

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Can't comment on he Nissins but an RCS 19 made a huge difference in power and feel on mine. No longer have to continually bleed them either. Not a great fan of the std. master cylinder. Bit more stuffing around with the Brembo re brake lines and mirrors. Can't use the std. mirrors unless you make/buy adaptors which makes the bars a bit crowded (and they don't look right either cos of the mirror base). Brembo do master cylinder clamps for std. 8mm, 10mm mirrors. Yamahe MT-09 or 10 mirrors suit ok or go bar ends.

Cheers

Deano
 

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No worries. You'll love the Brembo compared to the Nissin. The banjo bolt is a different thread pitch so if you order don't forget the bolt too, Nissin one's no good for the Brembo.

Cheers

Deano
 

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Some of the more technically inclined guys can correct me if I'm wrong but from my limited knowledge you can't just slap any MC on there. You need to match the MC to the piston size of your caliper.

As such I would personally go the route of replacing the calipers and the MC. The Brembo M4 matched with a 19RCS would be excellent and not to mention easier to get then a M50/17RCS setup.
 

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He has the axial mount Nissin calipers (earlier model F4s and Brutales)....Fork bottoms required to change to radial calipers. $$$$

Just go with the 19.... It will stop.

May need to learn to use less pressure, but that's going to happen regardless of MC piston size since the Brembo (of either size) will make more pressure than the Nissin.
 

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Discussion Starter #7
Some of the more technically inclined guys can correct me if I'm wrong but from my limited knowledge you can't just slap any MC on there. You need to match the MC to the piston size of your caliper.

As such I would personally go the route of replacing the calipers and the MC. The Brembo M4 matched with a 19RCS would be excellent and not to mention easier to get then a M50/17RCS setup.
That is why I was asking if anyone had any experiences with the two piston sizes.

Its a hydraulic system, its just a relationship just like the sprockets on our chains. Make one side bigger and its impact on the other side is "faster." I dont need the large monoblocks on the other end, but if I did get them I would absolutely need a bigger master to compensate

My worry would be if I put the 19 on those smaller Nissin calipers my lever travel is a half inch from nothing to full lock-up. Was hoping to hear from someone who can either say, "Yeah I run XX MC with my Nissins and its perfect" or "Holy shit the 19mm makes my front lock up when a butterfly flaps its wings in China, get the 17."
 

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If anyone is interested i have a very nice x-cel braking pressure sheet that will do the math for you on getting that just right feeling. shoot me a PM with your email.
 

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Discussion Starter #9
I think I might have lucked into what I am looking for. Looks like Braketech does kits to mount those same nissin 6 pots to other bikes as upgrades and it looks like they are recommending a 17x18mm MC and only the 19mm for the later 4 pot design.
 

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RCS 19 on my 2006 with the early Nissin calipers transformed the braking nicely powerful and progressive and lost that 10mmfree space before the Nissin master cylinder bit.

Had to file a slight piece of the clip-on for the master cylinder to fit without fouling switch gear see pic
 

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?

Going from a 17mm Brembo M/C to a 19mm ......WITH THE SAME FULCRUM DISTANCE
The 19mm will take 20% more lever pressure to generate the same line pressure
Piston areas 226.98 to 283.53 mm^2
Me, I have PVM hydraulics, they came on my F4, with adjustable fulcrums, the reservoirs are being changed
Magura also makes radial M/Cs
 

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