I have a buddy of mine who owns a 1992 Buick Regal Custom w/ 4 wheel Discs and his brakes were really bad (grinding metal on metal), so he asked if I would help him change them. I said no problem, however he informed me that just last week he was driving a heard a pop or burst of some sort, and than his brake pedal went mush. He was almost zero braking capability now, and the pedal goes right to the floor basically. Definitely sounds like something happened besides just having bad brakes in desperate need of rotors and pads. I was wondering if anyone has any clues as to what may have broke or gone wrong? I know there are several parts to brakes (master cylinder, brake booster (power brakes), rotors, pads, calipers), however I honestly don't know what the master cylinder does or the brake booster.
Thanks in advance.
