ok I had to replace a caliper on my 2000 Bravada. while I was at it I replaced both front brake hoses. all went great. but alas not matter how much I bled then pedal goes to the floor. replaced master cylinder 3 times still nothing. tech 2 scanner shows no codes. ran thru the modules, all good. bypassed the abs unit just in case. still pedal to the floor. bled at least a gallon of dots thru this thing. nothing. new booster and all new steel lines. it needed them . Minnesota car. I'm stumped. anyone have advice. yes I'm a mechanic, yes I have a tech2 and kind of know how to use it kinda. HELP !