Should I change out my rotors?

As long as there is not deep grooves its probably fine. However, they really aren't that expensive if you are doing it yourself and after 100,000 its probably not a bad idea. Its really easy to do as well.

only time i change out rotors is if i feel vibration in the brake pedal while braking indicating warped rotors. That's it. Used to turn them on our lathe but they're so cheap now that I just replace them.

I just order the rotors and pads kits off of 1A Auto and do it all. Its simple and not very costly.

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Change them. If you don't then you'll need to before the next time your pads wear.

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That is what I'm leaning towards.

What would cause the pitting? Debris? I lived in Florida for a while and sand would get everywhere.

Not sure what you're driving but on my toyota sequoia changing the rotors out with the brakes added about 5-10 min per rotor to the job.
Maybe 15 on the 1st but once I figured it out the second was easy.

If you're doing pads anyway, just buy a kit from rockauto.com. Pads and rotors together.

Just changed the ones on my wife's 2014 Pathfinder Platinum which has about 92K miles. They were shaking a lot on high speed braking. It was real easy and ordered the replacements through Amazon for right at $100. Included new pads, brake fluid and brake cleaner. I think new pads at Auto Zone will run you $35-70 depending on what you get, so I thought it was a great deal. Not sure what vehicle you have, but here's the link for reference.

LINK

As others have said, unless your rotors are warped and causing your brake pedal to vibrate, you probably don’t need to change them. All rotors will have some amount of scratches and scoring on them and they will rust when they get wet anyway. It’s impossible to tell if a rotor needs to be replaced just by looking at it - well unless it’s broken in half or something .