Quote:
Originally Posted by 00GTP4ME
Others on here may have better opinions, but because 80% of your braking is done on the front wheels, I think replacing the rear rotors just because you need to replace the fronts is a bunch of crap. Technically, your rear brakes should last almost five times longer than your fronts (ok, maybe not quite that long, but you get the idea)! However, you DO always want to change both sides of your brakes if any one side needs replacing (ie right vs. left / driver vs. passenger).
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In the old days of disc/drum non-abs brakes, this was true (maybe not 5x, but 2x was very common). With today's cars, the fronts and rears wear much more evenly (my 99 GP wears brakes so evenly it's scary). The rear rotors are pretty thin even when new, so the chance to turn them is slim. Replacement rotors are pretty cheap (maybe even cheaper than turning your old ones). I agree that someone telling you to replace all 4 corners just because the fronts are down is a bunch of hooey but if your car is like mine the fronts and rears wear down almost identically, so you may actually need both. Also (as 00GTP4ME stated) never replace only one side when doing brakes, always replace brakes per axle set.