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Old May 10th 2019, 11:58 PM   #11
Taz
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Originally Posted by Hejnfelt View Post
Currently evaluating whether to add an Brembo XR 19x18 front master. Really dislike the stock brake pump. anyone tried the stock calipers with the Brembo XR 19x18 and Z04 pads?
I'm not an expert, but if I'm not mistaken the 19 mm piston in that master cylinder will not be well matched together with the smaller pistons of the M50 calipers. I believe that is why Brembo released the 17 RCS. Not sure if there are higher spec masters with 17 mm piston though.
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Old May 11th 2019, 12:12 AM   #12
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Originally Posted by Taz View Post
I'm not an expert, but if I'm not mistaken the 19 mm piston in that master cylinder will not be well matched together with the smaller pistons of the M50 calipers. I believe that is why Brembo released the 17 RCS. Not sure if there are higher spec masters with 17 mm piston though.
My idea is to try it out. I have a pretty good Brembo hookup and if I don't like the combo with the M50 calipers I'll throw on a set of GP4RX calipers instead.

Have you tried the RCS17? We tried fitting an RCS pump just 2 weeks ago but it didn't fit due to the fluid nozzle angles.
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Old May 11th 2019, 02:50 AM   #13
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Originally Posted by Hejnfelt View Post
My idea is to try it out. I have a pretty good Brembo hookup and if I don't like the combo with the M50 calipers I'll throw on a set of GP4RX calipers instead.

Have you tried the RCS17? We tried fitting an RCS pump just 2 weeks ago but it didn't fit due to the fluid nozzle angles.
He is correct in that the 19mm piston does not work with the M50 calipers. Some will tell you that it does, but your brakes will feel like wood. The RCS 17 is the correct size. You have to use different reservoir mounting brackets.
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Old May 11th 2019, 04:43 AM   #14
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Originally Posted by Hejnfelt View Post
My idea is to try it out. I have a pretty good Brembo hookup and if I don't like the combo with the M50 calipers I'll throw on a set of GP4RX calipers instead.

Have you tried the RCS17? We tried fitting an RCS pump just 2 weeks ago but it didn't fit due to the fluid nozzle angles.
No I don't own a Ducati, or any other bike with M50s, but I spent some time researching the subject when I upgraded the brakes for my old GSX-R.

The XR01171 and the GP4RX calipers is probably a sweet combo though!

Last edited by Taz; May 11th 2019 at 04:47 AM.
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Old May 11th 2019, 07:40 AM   #15
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My first choice in all this would be the RCS17 anyway as I had it on both my RSV4s with the M50 calipers and Z04 pads and loved this trio. The problem is that we can't fit the RCS17 on the 1299 due to the steering damper being in the way. Does anyone have a tip for fitting the RCS17 on this bike? I haven't tried a 19mm piston on these calipers before but can understand why it's not a great combo.

Originally Posted by Taz View Post
No I don't own a Ducati, or any other bike with M50s, but I spent some time researching the subject when I upgraded the brakes for my old GSX-R.

The XR01171 and the GP4RX calipers is probably a sweet combo though!
Yeah I've read so too, especially when the system gets warm - although for street riding when the system is cold it might be a bit aggressive I've heard. Have you tried?
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Old May 11th 2019, 08:49 AM   #16
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It fits fine.
You just need a longer reservoir hose and a different bracket.
It took me about 15 mins to make a bracket from alu strip.
I mounted it on an expanding collet used for bar ends etc, that was placed at the
inner end of the clip on.
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Old May 11th 2019, 09:04 AM   #17
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I did the same. I installed the Rizoma clipon reservoir brackets and a race switch. I had clearance issues with the bleeder nipple on the RCS master cylinder hitting the faring near the fairing stay on the clutch side. Itís tight, but clears.

Tried both the RCS 19 and 17. The 19 felt wooden and lacked feel. It brakes but provides no sense of how hard you are braking. The 17 is a much better fit with plenty of feel.

Originally Posted by 990Glen View Post
It fits fine.
You just need a longer reservoir hose and a different bracket.
It took me about 15 mins to make a bracket from alu strip.
I mounted it on an expanding collet used for bar ends etc, that was placed at the
inner end of the clip on.
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Old May 11th 2019, 09:56 AM   #18
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Originally Posted by Hejnfelt View Post
Yeah I've read so too, especially when the system gets warm - although for street riding when the system is cold it might be a bit aggressive I've heard. Have you tried?
I have not tried either yet, but I have just received an XR01171 for my S1000RR. Won't be able to fit it for a couple of weeks, but will let you know how it performs when I do.

I have been warned that the XR should not be used with ABS though. Some claim that the seals in the mc will degrade faster if ABS is activated often. I do however find it hard to believe that the seals are very different from those in for instance the RCS, which is supposed to be fine with ABS. I'm interested in finding out if there is some merit to this claim or if it is simply due to the fact that it is a "race only" part which does not carry any certification for road use.

Regarding heat in the system, I would think that mainly applies to the pads. I can't see any benefit of heat in the calipers themselves, rather the opposite.
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Old May 11th 2019, 01:20 PM   #19
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Originally Posted by Taz View Post
Regarding heat in the system, I would think that mainly applies to the pads. I can't see any benefit of heat in the calipers themselves, rather the opposite.
Pads especially yeah but also just the feel of the system. Certainly I had that with my previous bikes. A proper setup system is a bit aggressive (bitey) when cold and gets smooth after the first few hard braking maneuvers or maybe I've just convinced myself of it, what do I know - placebo? But I feel more in touch with the front discs after a few corners.
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