I just jacked the vehicle and try to shake/knock/punch and nothing gives or produce sound. I removed the tire and try shaking the brake using hand and it moves a tiny bit. Can feel its metal to metal contact so i removed the caliper pin and cleaned them; I cant feel any wear with my fingers. The pin comes with that flat surface and its not cause by wear and tear. There is some metal contact sign but no wear can be felt using finger. When i put back the caliper in the slot and try to shake it it moves in all direction for the bottom pin but the top pin only moves very slightly. So are the pins worn out? If yes should i go for original pin or aftermarket with silicone ring?