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Figured it out, just needed to do old fashioned brake bleed, using pedal, all is good now.

Well i bought a new master cylinder, this one had the hole where the vent is blocked off. Having the same issue, i also adjusted the shoes in all 4 corners. I am at a loss, any ideas?

Hello, I recently purchased a new to me 1963 M37, i am changing all the fluids and I changed the brake fluid. I hooked up my mighty vac and I bleed each wheel in the proper order, keeping the master cylinder full. There is absolutley no pressure in the pedal, if i keep pumping it builds...