Yet another blake bleeding question Options

[florida 914]

Sorry, folks, for asking yet another question about bleeding brakes, but I can't find the answer to this specific question and am at wits end.

I have a 1971 914. I am only able to get about a quarter of a pedal, i.e. it is off the floor, but only just, and no more improvement no matter how much we go through the routine. What seems weird is this: when I open the rear bleed nipples, the pedal goes to the floor (as my assistant pushes), but nothing like that happens on the front. I don't see air being pushed through on any corner any more, but there is fluid moving on all four corners (though probably more on the back than the front). And the pedal never pumps up better than a quarter or so even with all nipples closed.

We have installed rebuilt calipers, new pads, new flex lines, and a new master cylinder (in fact, we tried a second new master cylinder on the theory that the first may have been faulty). As far as I can tell there is no clog in the fixed lines (we checked the front especially).

Any suggestions?

Thanks!