Ever since I got my 78 Z the brakes have felt terrible. At first it was the reactionary disc causing my woes, and I replaced my booster with a reman unit that had the disc inside, mine was unfortunately long gone and not rattling around inside my booster. After replacing the booster the brakes definitely felt way better, it was no longer an on/off switch that would throw my face into the steering wheel, but the pedal still felt off and I couldn't bleed all the air out of the system. I ended up tracing this to the front passenger caliper having an internal leak and replaced it, but after bleeding everything three times my pedal is still spongy and doesn't engage any brakes until about 1/4-1/2 way down the pedal travel. I can pump the pedal up a bit, which to me indicates there's still air in the lines, but I don't see any air coming from the bleeders. I'm pretty sure I have my process down correctly, I start at the master cylinder and then move to the rear driver's side and then go counter clockwise around the car from there, but no matter how many times I bleed no more air comes out and the pedal still feels exactly the same.