Looks like Mustang calipers on the rear. Make sure they are adjusted for minimum pad clearance.

I can't identify the front calipers, is there an OEM application?

I'd look up master cylinder bores for the donor vehicles and just as important the stroke of the cylinder.

You may be running out of pedal travel before reaching high enough pressure. And 1200 sounds low to me.

Last edited by ruderunner; 02/12/23 08:14 AM.
Angry white pureblood male