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Rust spot on a rear rotor

886 Views 3 Replies 2 Participants Last post by  EcSTSatic, 
W
About two years ago I got a chance to checkout all of my rotors, all of them looked fine except one rear rotor which has a ~1/2" diameter indent in it with rust, like something ate away the metal or something. The mechanic told me that happens when the brake doesn't get enough use and it should go away when I use the brake more often. Car stops fine so I didn't care, correct me if I'm wrong but it's the brake pads that gets worn away and not the rotor too right?

The other day I took my car into a different shop(I've never been to this one) for an oil change and tire rotation and the guy told me I should get my rear rotors and brake pads replaced in the next month or "I'll start hearing the brakes", I'm pretty sure he means the pads are almost gone and I'll be scraping metal to metal. Now can I just replace the pads and leave the rotors alone? I don't really see the point of getting new rotors if they're not warpped or scratched.
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Maybe a better description would help 'cause you sound like you are contradicting yourself. First off, pads and rotors wear - eventually both need replacing but not necessarily at the same rate.
What does "indent" mean? If you have a 1/2" groove in your rotor where the pads grip then you've lost that much contact area.
You can replace the pads only but if I read your first paragraph right, one of your rear rotors is damaged. Don't you have wear sensors for your dash warning?
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Sorryy if I sound confusing, there aren't any grooves on the rotors but one of the rear rotor have a ~1/2" "indent" that looks like a geode. I wish I can take a pic of it but the stock rims barely have any openings.


^^^ Imagine the outer edge is the rotor and the crystal part is the ~1/2" indent and instead of crystals it's rust. I'm gonna take it in and have a look myself this week and take some pics.
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If it's the outer edge which spans the thickness of the rotor, rust is normal on OEM parts. They aren't coated like the aftermarket performance rotors.
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