Which booster/MC combo for disk/disk

[Billhilly]

As far as master cylinders go for disc/disc I have just finished an all new install in a 72 K2500 with stock front and Eldorado rear calipers. CPP sold me a 1" cylinder specifically for the job that I blindly installed and plumbed up. It gave me brakes, but a very long pedal (almost to the floor). After much discussion I swapped in a 1 1/8" cylinder and problem cured! So personally, there is no discussion. 1 1/8" gives you the volume you need for calipers. Calipers require more volume than wheel cylinders.... Oh, stock booster, Wilwood adjustable proportioning valve. Oh again, Thanks for nothing CPP!