I've personally encountered two bad Wilwood master cylinders (brand new) and heard of many others that just won't ever bleed out. All were exchanged for another that worked, but I have little confidence in them. I'd bet that a different MC with the same bench bleed process you used would get a good pedal.
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Jeff: Project "Rolling Mockup" 69 Camaro SS, AFX, TKO600, Baer GT, etc
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