Mercedes Benz repair: 1997 Mercedes E320 No Brake Pressure, calipers, master cylinder

Question
There is no brake pressure. tried changing the master cylinder twice. Rotors, sensors have been changed. Brakes have been bled. The dealership cannot figure out this problem either. Please help if you can. Have had the car since May and not been able to drive it. Thanks!

Answer
jackie,
First thing you would want to do is check to see if you are having any pressure to your calipers to do this you will need to take off brakes and then press your calipers and have someone pump the brakes to see which caliper is not responding it may take a while to find which one though but i am sure that one caliper is not responding when pumped.