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Old Jul 12th 2013, 04:13 AM   #1
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Have you replaced your front brake MC?

I don't recall anyone posting any specifics on if they've done this or what their thoughts were? I tend to feel the OE lever feels spongy IMO. I've bled them many times, not super satisfied.

Thanks guys!

Last edited by TransNone13; Jul 12th 2013 at 04:16 AM.
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Old Jul 12th 2013, 04:41 AM   #2
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Lots of issues if you replace your front MC. The slight soft feeling is a result if the abs valve. If you plan in replacing your MC you need to match it up with the caliper (wgich you can do but very few do).
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Old Jul 12th 2013, 04:48 AM   #3
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Originally Posted by anthem View Post
Lots of issues if you replace your front MC. The slight soft feeling is a result if the abs valve. If you plan in replacing your MC you need to match it up with the caliper (wgich you can do but very few do).
By match it up, are you referring to SC size as well? Is there a set ratio? And thanks for clarifying the ABS thing, it makes sense now...
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Old Jul 12th 2013, 05:35 AM   #4
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Originally Posted by TransNone13 View Post
By match it up, are you referring to SC size as well? Is there a set ratio? And thanks for clarifying the ABS thing, it makes sense now...
http://ducati1199.com/mechanical-tec...es-beware.html
Thanks from JeffD
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Old Jul 12th 2013, 05:37 AM   #5
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Lol Ok, thank you!
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Old Jul 12th 2013, 05:40 AM   #6
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Stolen from a previous thread re: RCS19

Here's some exc. info posted by Shazaam on the Ducati MS forum

Brembo M50 Panigale callipers on 999? - Ducati.ms - The Ultimate Ducati Forum

"When you design a hydraulic system it's important to have good feedback from the lever as to how much lever force to apply to achieve a desired braking rate. Having good feel, sensitivity and control is the major factor influencing braking quality.

The main factor in designing good braking modulation characteristics is the ratio of the total area of the caliper pistons to the area of the master cylinder.

The Panigale calipers have a total piston area of 5655 sq. mm and has a master cylinder area of 201 sq. mm. This gives a hydraulic ratio of 5655/201 = 28.1.

The RCS brake master cylinder has an area of 284 sq. mm. Used with the Panigale calipers you get an hydraulic ratio of 5655/284 = 19.9.

A general design rule-of-thumb for twin rotor brake systems is as follows:

30:1 - soft feel
27:1 - sweet spot for design
23:1 - firm feel
20:1 - wooden feel

So the use of a RCS master cylinder isn't going to blow your piston seals but it will result in a lever that gives almost no feel, so braking will be extremely hard to modulate.

Dennie, the 1098 monoblocs have a caliper piston area of 7263 sq. in and used with the RCS will give you a very nice hydraulic ratio of 7263/284 = 26.6."
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Old Jul 12th 2013, 05:55 AM   #7
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I'm assuming the does not apply to switching out the fluid reservoir. Is there anything to be aware of if I were to go with billet or some other better looking setup?
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Old Jul 12th 2013, 06:00 AM   #8
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Originally Posted by TransNone13 View Post
Lol Ok, thank you!
YW! Just FYI, Brembo & Accossato do make radial brake masters in 16mm versions, both fixed leverage and adjustable versions (Brembo RCS & Accossato PRS). Either would be fine with the M50's, but I'd agree with Anthem that your soft feel issue is ABS related. Note that the masters on the aftermarket ones are perpendicular to the bars rather than angled out like the OEM master, so unless you changed to one of the smaller aftermarket start/kill switches as well, you'd run into clearance issues with the lever hitting the throttle housing.

Correction: (thx Anthem) - Brembo's smaller-piston RCS is a 15mm on the brake side; the RCS16 is for the clutch side. They do make fixed ratio 16X18 & 16X16.

Last edited by Steve B; Jul 12th 2013 at 06:37 AM.
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Old Jul 12th 2013, 06:10 AM   #9
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Have you replaced your front brake MC?

Yes as others have alluded to here since I am in an airport and was too lazy to type - you have several issues. Fr the brake mc they went from a 19 to a 16. So changing to a 19x18/20 would kill any sort of feeling. Yeah you would get the rock hard initial feeling but no modulation at all. It's bad, real bad. You do have the option of going to one of brembo's mc for single disc brakes at 16mm. I think rcs does not come in 16 but 15 which should be close enough. It's just that very few carry or buy the non 19x versions that its pretty rare as that's probably 99 percent of brembo's sales on that front.

Otherwise you also upgrade the caliper. All the better calipers are standard 19mm so you are then free to use any of brembo's masters from the rcs, billet, forged, GP units.

Also there is a spacing/clearance issue. You should put an aftermarket start/stop switch to clear that big monster thing. Several mfg make those. One even ties into the backside of the mc handlebar bracket.

From clutch there is a switch issue at is reversed from normal as well.

I should add - consider changing z04 brake pads as a first upgrade as its pretty effective. Then flip a coin on whether youvwant to do rotors, caliper and cylinder upgrades.

Last edited by anthem; Jul 12th 2013 at 06:22 AM.
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