psychoticminds1

Hi guys. Im haveing trouble with my 04 non brembo brakes. I have about 22,000 miles on my car and im on my 4th set of rear rotors and still on my first set of fronts. The pads are stock all the way around. The problem i keep having is the rears warp within a few thousand miles i have checked that the slides arent binding and that the calipers can move freely in the brakets. And the cost of constantly replacing these things is going to kill me luckily i have a friend in nissan that keeps getting them for me under warranty but its still annoying. at first i thought possible runnout of the rear hub? but now im kinda thinking its a praportioning (Sp?)problem because the other day i stopped short and i heard the rear wheels lock for a second and the fronts didnt which shouldnt happen expeciualy considdering im running a 255/45r17 in the back. im losing my mind over this and nissan says they cant find anything wrong. sorry about the long rant but im at a loss for what to do next any suggestions?