These are brand new Cobalt rear rotors with only a couple autoxes on them. I was very careful to season them properly when new. I've noticed that the rear passenger rotor as a few marks on the rotor surface that looks that it has been burned or discolored in some other way.

I was very careful never to engage the parking brake (or the brakes for that matter) when they were hot, but I'm assuming that is what hs happened. Performance has not ben affected.

Is this something I should be concerned about or is it just fine?

 

I've seen them on alot of cars - i wouldnt worry about it.

 

That's what I thought... thanks.