The pedal would slowly sink to the floor before changing the master Cyl. otherwise the system seemed to work properly when I began. After replacing the master cyl. I followed the RR, LF, LR, RF bleeding sequence. When bleeding the RR and LF lines flow forcefully and are free of air, but I get no pressure or fluid flow at the LR and RF wheels. Under pressure the new master cyl is pushing fluid at both of its outlets. The brakes are spongy and require pumping to work, but when pumped and applied they hold pressure. I don't see any crimped brake lines.
Notes: 1996 Camry, 4 cyl. Front disc, rear drum. No ABS. New Master Cylinder carefully primed.