Hey guys, I ran into some majoring brake problems with my Buick a few days ago. Went and hit the brakes, and nothing there, almost got myself into a good accident. Brakes went right to the floor, and as of right now, i barely have brakes, unless i pump the hell outta the pedal. Even at a stop. It'll stop me, and i'll feel the pedal go right to the floor and i'll start moving until i pump them. I did the whole front end with new pads, calipers, rotors, and I am in the process of putting on new drums, shoes, and wheel cylinders. Also going to change the master cylinder and i have a few questions. How hard is it to change out the master cylinder on hrdroboost? I heard something about a spring in it that can cause damage? Can someone tell me whats involved with this? Also, since the system only has pressure when the car is running, does that mean I have to have the car running in order to bleed all the brakes? if anyone can help me with this, it would be much appreiated..