i have my ek that i just replaced a driver side front caliper on because the previous one had a failing piston boot. after new front brake pads and caliper were installed i proceeded to bleeding the brakes (in sequence) from back right and finally driver side front. felt solid no air bleeding out. i start the car up and the pedal under slight pressure goes all the way to the floor, and slowly comes back up.
i just cant figure this out next to dumping the entire system of fluid and filling it back up and bleed each brake to guarantee no air. i dont think master cylinder because the car didnt have this issue before this entire deal. anyways just shoot me some ideas, im all ears.