Theroy time. Ok, so as most of you know, i'm doing a massive brake upgrade on the hatch. fronts: 11" blanks/ wilwood 4-piston calipers, goodridge lines, wilwood pads rear: 11" blanks, non-vented (oem style) with oem-style nissin calipers, goodridge lines, axis pads master/booster: 91 civic ex 4-door 15/16" master, stock eg dx brake booster (yes, it bolts right into the booster for those of you who are wondering and has the same outlets for the hardlines-- no bending/etc.-- best way to get a 15/16th in there) and now, for the purpose of the question: to use the 3040 (stock.. or 4030, whatever its called) or the 4040 (from a DA teg non-abs). Money aside, (i have the 4040 already), so this isn't a money issue. Now, from my understanding, the way a ppv works is like this: 4040: under normal braking, it splits the fluid up pretty much evenly. but under hard braking, it sends more to the front to prevent locking the rears (due to extreme weight transfer) 3040: under normal braking, it splits the fluid up pretty much evenly. but under hard braking, it sends more to the front to prevent locking the rears (due to extreme weight transfer), a little more than he 4040 would, thus making the 4040 have more fluid getting to the rear brakes under hard stops. if i'm wrong in those assumptions, please correct me. i'm still a n00b when it comes to brakes. now, with my setup, i'm using an overly large rear. in fact, my rears are probably equivilent to an ITR's fronts, minus the heat factor of being non-vented. my fronts are huge, though, as well, and with the 4-piston setup, it should stop very well. but will the 4040 still send too much to the rears and lock me up too soon, and cause my ass end to get loose during braking? I hope i explained my self clearly. The whole point of this is that i don't want to swap it out after and go through the whol bleeding process if i don't have to. plus, the blue smirf gizz brake fluid i have isn't exactly easy to come by at autozone or something.. gotta get it from E who gets it from his mom who gets it from work... lol so, which would you start with-- the 3040, or the 4040, given the above setup.