I have the Blazer dual piston calipers in the front and 2002 Camaro rear disk setup. I only changed the proportioning valve to disk/disk type. Master Cyl and Booster is the original one from 1987. I have no problems of any type with the brakes, no mushy, no pedal to the floor, good pedal travel and it stops really well! Changing a bunch of stuff only leads to all sorts of problems such as adjusting the booster rod to pedal distance, IMO
