Hang about guys, granted I'm only a simple metal basher, buy how can the vehicle weight, friction area etc etc etc have anything to do with the caliper force?
Caliper force ( as requested by the OP) can only be a product of line pressure multiplied by caliper piston area.
The line pressure is a product of force applied to brake pedal X mechanical advantage, X piston area.
FWIW a servo doesn't increase line pressure, only reduce pedal effort.
Anyway, one raggy assed metal basher retires and awaits to be shot down in flames.
Why am I getting the feeling this will run and run?