My rear brakes have always created a ton of brake dust, and at about 30k miles I checked the rear pads to find they were almost completely worn. I changed the pads, greased everything up back there and the brake dust still continues to pile on. Before I go changing calipers I wanted to know what this little piece does, does it adjust brake strength or the amount the caliper backs off when I let go of the brakes?? I was thinking I could turn it and maybe make the back brakes less aggressive but I don't want to touch it without knowing what it does for sure.image.jpg