W123 with 2 solid inches of mush at the top of the brake pedal travel before any pads hit the rotors solid at all
I've pre bled and reprebled ad nauseum, used the reverse prebleed (inject B fluid into master with a large syringe) at output port, no way jose
I've got 3 spare new or rebuilt master cylinders here in boxes tried each one not a bit of difference
rebuild LF caliper, one piston was frozen, helped make braking better still got the hellish 2 inches of nothing.
got one of those nice brake fluid pressure bleeders, of course didn't help a bit.

Anybody got any ideas?
Even called the Continental German M. cylinder maker, got the run around.