SB mopar mechanic needed in southern MA.

having trouble with brakes locking up. had hydro-boost setup early on, worked fine(but very touchy). then seals went & they didn't stand behind their product. now i installed a power booster/master cylinder(8" bore) and electric vaccum pump. still have original brass proportionong valve on frame. now brake peddle won't release w/o me pulling up on it with my foot!!! undrivable to say the least. any hints??