As some people know I am working on a BBK for the E28/E24.

I am working on a 635csi but brakes are interchangeable across the board.
I changed my master cylinder to the 750il which should be close to the E34 one.

I installed front wilwood calipers with 1.38" pistons (4) and rear 540i caliper with 40mm (1.57" x1)

Now, the idea is to keep the stock master cylinder and keep the stock pedal height or something similar.

My guess is to achieve it, I need to keep the overal piston surface the same.
Meaning stock setup overal piston surface = 4 pot caliper piston surface.
That should give me the same pedal height.

Am I going through it the right way? I intalled some 1.75" piston calipers (4 pot) are the front and the pedal seems too low.

The idea is to have front and rear 4 piston calipers on the stock master cylinder.

Thanks.