1992 Nissan Maxima 165,000 miles 3.0 V6

The rear brakes on my maxima (disks) dont seem to work. The ebrake does and fluid come out of the lines when I bleed them but they dont work. I greased and de rusted teh guide pins to no avail either. Whats wrong? Nissan maxima, 1992, 3.0 dohc 4 wheel disc abs brakes 165,000 miles, GXE