Std piston size... brakes

[vibrating_Cake]

Looking to convert from the 3 way master cylinder to a 1 way master cylinder so i can run a remote servo...

but i need to know the size of the master cylinder i need

 

can get them in

 

0.625in

0.700in

0.750in

 

the car is a std 2.0 mk3 capri with disks on the front non vented and biggest drums on the rear.

 

should be same setup as most of the oldskool fords so i thought i'd put this topic in chitchat rather than car specific