maybe try bleeding it backwards. put a hose on the bleeder into fresh fluid, and install your mighty vac at the lines at the master cylinder. ive also had good luck with making a master cylinder cap, and adding a fitting to the top so i can lightly pressurize the master cylinder 15-20 psi to help push fluid threw. you can also try pluging the master cylinder ports one at a time to see if its a problem with the front, or rear.
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1960 Chevy C10 Apache
1969 Chevy Nova
2007 Chevy TBSS
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