I bought a 7" dual diaphragm booster/master cylinder/prop valve combo from Classic Industries under their part number PB828D. The prop valve has a CPP sticker on it, the master cylinder has CPP embossed on the sides so I'm pretty sure it is the same kit as CPP part number 5864BB4. Question 1- is this the same kit? Question 2 - what size bore is the master cylinder? I'm not getting near enough brake pressure so I have a hard pedal.