I don't know if this is a 'problem' or not. My CR-V usually stays outside. Yesterday it rained during the day. I did not drive it at all. When I went out this morning to leave, I noticed that all four disc brakes were rusty (light brown). When I was backing up and for a little while longer, they made a small grinding noise until the rust was knocked off from applying the brakes. I guess the brake pads knocked the rust off. When I was done driving and got out, the brakes looked like new (silver and shiney like they should look). Maybe this is normal? Has anyone else experienced this?