Quote:
Originally Posted by ForceofWill
The reason I say crappy re-manned master cyl's is because he said he's already tried all that stuff and it seems like he knows wtf he's doing with brake bleeding. My front took a lot of pumping to get firm but no more than 20 mins. After all of the stuff you've tried I can't think of anything else.
If you feel like breaking it all down again you could try and swap the good OEM master onto one of the other bikes and re-bleed and see if it works.
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Bad master cylinder is a possibility. My experience (albeit limited, as a shadetree mechanic) is that a bad master cylinder either doesn't pump up pressure at all, or pressure can be pumped up to seemingly normal with a few strokes of the lever (or pedal, as the case may be) before going limp again after sitting for a while. I've never seen one "partially fail" as described. But I'm sure it's possible.
Another thing to consider is a bad hose from the MC to the caliper. Could it be soft and expanding slightly in diameter as one squeezes the brake?