Tech advice sought...
 

My 02 Eldorado ETC Collectors Edition has a brake problem. Heres what happened..rear brake line rusted through and blew out. I replaced it and tried to bleed the brakes. Didn't work. I replaced the two rear calipers because the bleeders broke off in the calipers. Bled the crap out of them and still pedal goes to the floor. Put on new Master Cyl and still the same pedal to the floor. Took it to a shop and they tried "computer" bleeding it and said the abs pump/module is not responding. I brought it back home. I just wanted to get some advice before I go and spend the $300 for another module. I have a hard pedal when the car is NOT running but when the car starts the pedal goes to the floor. Any advice is greatly appreciated!...Thanks