I usually buy cheapo rotors, they last as long as the pads, at which point I replace w/ loaded rebuilt calipers and new rotors. Front rotors only lasted 18 months or so (18k miles), so I replaced with brand name from FCPGroton (Brembo, $35 instead of my cheapie $15 ea). Now in less than a year they're warped again. The backing plates (splash guards?) are totally gone, they rusted out. Would that be the problem or over-torquing (my sons did the brake work, my wife warned about not tightening - once one of my sons didn't tighten the lug nuts and..). I might actually get these ground down since they're not very worn - but what's my solution? My wife's getting mad. Thanks.