Limmerz

Sup guys...

I just hit 60k a little while ago and last week I had to change my front brake pads. I posted this problem before....about my pads rubbing against my rotors. I was just wondering if anybody had to have their calipers or rotors replaced and when you had to do it. I think i just need to get my rotors grinded down...but what causes my rotors to need to be grinded??? Anybody had caliper problems?? Cuz if my rotors beging grinded don't work...i'm putting on new calipers. Any info would be appreciated...thanks!