
running 4 pot 2wd cosworth calipers with 40mm pistons up front and 2.0 capri drums on the rear, anyone care to suggest what size MC I should use?? 
My Viento uses the same front set up but has sierra discs on the back, it also uses twin master cylinders Girling .70 for the back and Girling .625
for the front using a balance bar between the cylinders, it works well but needs a fair amount of brake pedal force to stop it from high speeds.
I was thinking of using a pair of .625 masters and making it a single circuit system and fitting a Servo to give my right foot a rest.
Hope this helps
Alfie
When i first built my car, it had 2.8 capri drums and front calipers/disc's on a single circuit with a Tilton 0.7 master cylinder. Worked very
well.
Over the years it's changed to Willwood midilight 4 pot/285mm discs on the front and sierra calipers/disc's on the rear, and still works
well with a single 0.7 master cylinder but with slightly more peddel travel so i might change it to a 0.75" in the future .
Ian