Hi all, Here the deal, I have the original 4 piston front brakes and the original non-power master cylinder with the separate PP valve for the front brakes only. This is all factory original. I rebuilt the master and replaced the pp valve with the original replacement part. Bleed the system several times. The brakes work fine, but when you first get in after several days or a week of not driving it, the pedal goes to the floor. You can pump it a few time and it regains pressure and is then fine while driving it. There are no leaks and the master is full. Why is it is this way????
