Good questions. The place I had doing work on it skipped over all the diagnosis stuff and install a booster vacuum now I'm putting the pedal to the floor every time I come to a stop and then I have to keep on pumping the pedal to maintain breaks. So the car set for years and I don't think anybody put any attention into brakes I pulled off all Wheels and brand new stuff is in the rear and front. I'm guessing that they may have just put the stuff in and never bled the lines. Thanks for your response let me know what you think