my car is acting just like fc3sports was. i just installed new rotors, pads, and stainless lines and i too have bled the brakes till i'm sick of it. i would not have guessed the booster because it was fine before the new parts, but i will try it.

 

I changed my booster to one off of my s5 parts car and that fixed it. My old booster had something loose inside of it. Hope this can help someone else keep from bleeding brakes for a week.