I just did the front pads on the 95 ng900 they had worn unevenly and the pads were grinding. The car sat for 2 years and the rotors were a year old prior to that. I step on the brakes and sometimes its hard as a rock and other times the pedal is softer. I did a full system flush with a power bleeder. I am thinking its the master. I have 186k on the car.