View Full Version : techie question- working out the correct size master cylinder bore for calliper size and type.
I understand there is a way of working out the size of master cylinder bore required for the size and type of callipers fitted. (ratio)
This results in a figure comparable to other bikes.
I wonder what is the best figure to obtain and why? Shazzam...............
Search on Shazzam's posts. He did great bit on exactly this a while back. 19x18 for twin four-pots, and 16x18 for a single as a basic rule. Depends on whether you want more initial bit or progressive feel.
Ali
Iconic944ss
22-Jul-2005, 00:19
Good question !!!!
Any ideas about bloody spongey 6-pot calipers :flame::flame::flame::flame:
Frank
PLEASE !!!!!!
So the formula is the area of the calliper pistons divided by the area of the master cylinder.
A std fireblade is around a figure of 34.5. An nc 30 is around 31.5.
Brake levers are about feel.
Too great a number and you have a hard lever, but no feel.
Too low a number and you have loads of feel but of course too much travel!
I would suggest from what your saying Frank, your master cylinder is too small a bore to cope with your 6 pots. ( what a std 16mm ducati master cylinder bore?)
Thats easy to see when you think of the amount of fluid required to move all those extra calliper pistons.
I bet your ratio is low 20's.
Brembo 19/18 master cylinder to sort me thinks.......
vBulletin v3.5.4, Copyright ©2000-2025, Jelsoft Enterprises Ltd.