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General Category => General Discussion => Topic started by: John A on May 08, 2021, 07:35:26 PM

Title: Front brake mc size
Post by: John A on May 08, 2021, 07:35:26 PM

 I’m going to put on another disc on Deb’s 02Stone because I’ve now gotten all the parts I need.  What size master cylinder do I use for a double disc non linked system?  I have that info at the shop and I’ll read over it but what experiences did you have with it?

Title: Re: Front brake mc size
Post by: RinkRat II on May 08, 2021, 11:38:21 PM

 Here's  some good info for what your doing.  Fun With Numbers!
     http://ducatimeccanica.com/brake_ratios.html (http://ducatimeccanica.com/brake_ratios.html)

      Good Luck
     Paul B :boozing:

Title: Re: Front brake mc size
Post by: moto on May 09, 2021, 01:24:47 PM

Another good source is Guzziology. You'll need to know the sizes of both your master and slave cylinders to get started.

Title: Re: Front brake mc size
Post by: John Croucher on May 09, 2021, 02:02:48 PM

Here are a couple of pictures on brake line routing I used to clean up appearance.
Bike originally had linked brakes. 
The right size m.c. will give you two finger braking.  To small and you will have a soft lever, to big and the lever will be hard with little braking.  Just guessing, I think I used a 14mm. on the front by Brembo.

(https://i.ibb.co/nRn1wcP/20201224-011804.jpg) (https://ibb.co/nRn1wcP)

(https://i.ibb.co/YTw33cC/20201227-004519.jpg) (https://ibb.co/YTw33cC)

Title: Re: Front brake mc size
Post by: moto-uno on May 09, 2021, 03:19:22 PM

  I might suggest you simply try it with what you have ( it may be fine , different , but fine) !   Peter

Title: Re: Front brake mc size
Post by: Turin on May 09, 2021, 11:45:48 PM

I like 14mm. 15mm also alright.

Title: Re: Front brake mc size
Post by: skippy on May 10, 2021, 08:21:44 AM

I found that when I converted my 03 Stone to a twin disc setup the 17mm master cylinder I sourced from an Apillia was just about perfect. Two finger operation would provide really good feel and feed back as well as haul the bike to a full stop with little effort.

Skippy 

Title: Re: Front brake mc size
Post by: John A on May 10, 2021, 11:33:59 AM

When I get the bike and measure what  master came on it with the original single disc I can get an idea of how it’ll work for two discs by the charts. Thanks for the replies

Title: Re: Front brake mc size
Post by: Antietam Classic Cycle on May 10, 2021, 12:12:34 PM

Quote from: John A on May 10, 2021, 11:33:59 AM

When I get the bike and measure what  master came on it with the original single disc I can get an idea of how it’ll work for two discs by the charts. Thanks for the replies

It should have a PS13 front master cylinder. The calipers are P4 30/34. Using an average of 32 mm for the 4 pistons, you'd end up with a 24.2 to 1 ratio. Just for reference, the V11 Sport used a PS16 with a pair of the same calipers.

Title: Re: Front brake mc size
Post by: Tusayan on May 10, 2021, 01:50:25 PM

Quote from: Antietam Classic Cycle on May 10, 2021, 12:12:34 PM

Just for reference, the V11 Sport used a PS16 with a pair of the same calipers.

Which is equivalent to 5/8 inch, the typical master cylinder size used by almost everybody with those calipers.