No, you do not rivet new pads on. The rotor gets sacrificed with this brake system. The squealing you hear is most likely the preloaded spring in the middle of those brakes. I wouldn't tear it apart just for those, if it did break that spring.....you can basically pull them out with needlenose pliers. As to when to replace them? On the upper linkage, you will see 3 holes in the weldment. When you adjust to the last hole, it's time to order ALL the parts. All the plastic washers and all