A co-worker has a Chevy Tracker with front disc breaks. The rims are such that you can see the brake rotors. There appears to be a lot of rust on the rotors, however.
Should this be the case if the front brakes are working properly? He’s had the car for a couple of months now, and has said he has not noticed any difficulty braking.
It just seems odd is all. I would have thought that the rotors should be clear of rust.
The rotors are bare steel and so tend to rust pretty quickly if there’s any water about. Applying the brakes scrubs the rust off until the next time the car sits for a while, whereupon they rust again. The rust is typically the bright orange-red of new rust, not the dark red-brown of old rust.
If he’s got dark red-brown “old” rust, all I can think to say is that “that’s interesting.” <== lame
Notice that even if you go to a new car lot there is rust on the brake rotors (at least in a humid climate, where I live). As the others have said it’s just a very thin surface layer that doesn’t affect the braking.