Mine after removing:
Suddenly appeared on highway and made terrible knocking sound. Stopped immediately the car and thought that engine was blown :D However the pulley wobbling quite remarkable and clearly visible. The rubber was almost gone and there is no way it could just make this "quiet"...
I just did an overhaul to both rear calipers and this is what I found. One side had both pins with flat sides and the piston was somewhat okay. The other side had one completely round pin and another with flat sides. Unfortunately I didn't check which was which, but I put them back according to...
What could be the cause for metallic rattle? It kind of sounds like a loose heat shield and it happens only when accelerating, but not always. Revving the engine on neutral or lifting both front wheels up and accelerating doesn't reveal anything. It could be CV shaft also. Then it should click...
If it's already knocking, you should be able to move it sideways (without belt even rotate) by hand since the rubber damper from pulley is gone. See the video I posted earlier and you'll get the point.
It also wobbled quite hard when the engine was running.
My Accord's taillight was flooded with water. Took the light off the car, dried and re-sealed with weather-proof silicon all round. Haven't seen a single drop of water there since!