When stopped the brake pedal slowly goes to the floorboards. sometimes i have to repeatedly pump the brake pedal while at a stop light to prevent running into the car in front of me. took it to a dealership and they drove the car but couldn't fine any problems. the master cylinder leak down is getting progressively worse with time. i believe that i am qualified to write about this as i was, when younger, a top mechanic for porsche and volkswagen.