On the Motive power bleeder, what kind of adapter are you using to rig it up to your MC? I love my power bleeder, but I quickly found out that the universal adapter that comes with the basic kit is useless on an FC, as I could never get it to seal the MC all that well.
To get mine to work right, I picked up a spare MC cap from the boneyard, drilled a hole thru its center and inserted a brass nipple fitting in, then sealed it to the cap with epoxy. Hooked that up to the Motive bleeder and it works great. If bleeding is stubborn like you described above, I just pump up the pressure a wee bit more than they recommend and it seems to purge out that last stubborn bubble without harm.
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