Took my car into shop before rebuild and got my brakes checked bc when I brake it feels like im in the rotors but he said its not my brakes it was something else. I cant remember and was hoping yall might know what it is. It was something behind rear rotors said would also need to replace calipers. The thing he showed me looked like tank treads kinda that go on the gear looking part of other side of rotor. Sorry for the sloppy info