We're new to bicycle disc brakes. The first time I changed only the pads and had some squeaking. Second time I changed the pads and rotor now it's perfect excellent stopping and quiet for my BMX 29inch
Matched the original equipment on my Diamondback Response Comp DB78 mountain bike. Even though the original pads were a few tenths of a millimeter thicker than the minimum allowable wear, I could not adjust them further to get braking power. With the new pads, braking is restored.