Are the bleeders for calipars pointing up?Thats the first thing to check.I had mine on upside down and had the same problem and Ive done brakes as a tech for decades.Its easy to do.Then if not that get some plugs and block off 1/2 of master and see what it does.I run 70 C body master one all disc we convert.Even if we run drums the same master just for drums.Rocky