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Discussion Starter #1
Hi

Can I use my standard 996 brake master cylinder with radial monoblock calipers from a 1198 or will there be to big difference in the fluid flow?

Does anybody know the dimension of the piston in the standard brake master cylinder?
 

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Old Wizard
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I wouldn't.

The 996 master cylinder diameter is 16 mm (area: 201 sq mm) and the 1198 34/34 calipers (area: 7263 sq mm) which gives a hydraulic ratio of 36 (7263/201).

A a point of reference, the 1198 uses a 18 mm master cylinder giving a stock hydraulic ratio of 28.5.

As a general guideline for multi piston brakes, the hydraulic ratio should be as follows to get the following modulation characteristics at the brake lever:

30:1 - soft (longer lever travel distance, Ducati's preference for safety)
27:1 - sweet spot
23:1 - firm
20:1 - wooden (short lever travel i.e., on/off, poor modulation)
 

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Discussion Starter #3
Hi.

Thanks for the reply.. I found the same information and did my calculations as well and came to the same conclution.

With standard 16mm and 1098 calipers I also endend up with 36:1 ratio.. So I will also change the master cylinder :)
 
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