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Old 01-09-2012, 10:30 PM   #1
ArturoC
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How to find the bore/stroke of the master cylinder?

To play by the CMRA rules**, I want to ensure that I'm using a properly sized front brake master cylinder. I replaced the stock 675 front brake with an OEM brembo from a Ducati 999 or something.. it's hyooge!

I don't want to go back to stock. *** I'd like to get a properly sized Brembo aftermarket, but I dunno what the stock bore/stroke is. Can't find it online, on the MC itself or anything. I asked on the CMRA board, no response thus far.

Any ideas?





** I don't think anyone would protest, I just like to play by the rules.

*** I didn't like the feel, and it would always come back and hit my knuckles even when braking with one finger. I bled it over and over, and was going to replace it with another stock one, but at the triumph dealer, I squeezed another stock brake on a 675 on the showroom floor and it was the same as mine. Eww. Had a reputable shop bleed it, wasn't much better, so I replaced it.
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Old 01-09-2012, 11:40 PM   #2
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I was under the impression that the MC had to be stock - not just stock sized. I'm not a racer though so I could very well be wrong.

OR, just race superbike classes.
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Old 01-10-2012, 12:02 AM   #3
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Quote:
Originally Posted by agg2001 View Post
I was under the impression that the MC had to be stock - not just stock sized. I'm not a racer though so I could very well be wrong.

OR, just race superbike classes.

Nope. for superstock it can be replaced with the same type. Meaning if you have a radial, you can replace it with another radial, but you can't replace a non-radial with a radial type.

Quote:
Originally Posted by rulebook superstock section
l) Steel braided or Kevlar brake lines may be used. Brake pads may be changed. Brake rotors may be changed to OEM spec steel rotors. No carbon fiber, cast iron or other exotic materials are permitted for brake rotors unless stock. No oversized rotors. Master cylinders may be replaced with aftermarket master cylinders of the same type (this means the same bore and stroke and the same fluid displacement). Thumb operated rear brake systems are allowed.
I plan to race superbike too! But i want to race superstock by the rules.
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Last edited by ArturoC; 01-10-2012 at 12:05 AM.
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Old 01-10-2012, 02:10 AM   #4
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it's tough to match, the ducati you have is illegal, but realistically, if your not winning who cares. Someone finished 10th while you finish 8th is not going to protest, and if they do, youre not losing anything. Not that I am suggesting cheating, but unless you are at the expert level competing for factory money everyone is trying to find a small edge, even those guys

i know i didnt help, but thats the advice i got a year ago from cmra and wera officials when i asked the same question. go stock, or dont ask questions.
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Old 01-10-2012, 09:41 AM   #5
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Go to ebay. Get an 06+ R6 OEM brembo master. That will do the trick.
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Old 01-10-2012, 09:14 PM   #6
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Quote:
Originally Posted by Irak View Post
Go to ebay. Get an 06+ R6 OEM brembo master. That will do the trick.
It IS a great mc - especially being oem.
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