To make a long story short, since ive had my '96 ive had constant brake problems. Finally broke down and bought 4 new calipers, rotors and all new hardware. Bled, lubed and installed everything properly. 6 months later one set of my rear pads is already worn to the point i need to replace it, and one set in the front also. The other set have plenty of life. Not understanding whats wrong.