well they have been dissassembled and replaced pads/ discs but you can never get them exact. Like if you tighten them too tight, the wheels dont run freely and when they are loose enough for the wheels to spin, applying brakes doesn't do anything. Also by lumpy, i mean when the brakes are on and you push the car, you can feel different strengths as the drive shaft turns making the brakes feel lumpy even with new pads and discs.