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It's brakes not breaks. You can turn them depending on how far they've worn or if they've been turned before. Find out the minimum thickness (usually right on the rotor) and then measure them with a measuring caliper.
For $36 a piece, I would just buy new ones though.
Ha ha, lol.... no it's not, silly..... brakes Breaks refers to broken or when you have coffee for 10 minutes at work
Anyway, I would disagree slightly on what ZW said above. I think it is best to purchase a set (front/front or rear/rear) if you change rotors. They are very inexpensive and both should be wearing out at pretty much the same rate, even if not so easily noticed. You may also be dealing with slightly different density between metals of the two rotors and brakes may not apply so evenly. I don't know this for a fact, but would not surprise me if differences between manufacturers. Temperature is also going to play a role over time.
You also may consider exchanging your brake fluid and flushing out the lines. I did my '02 a couple years back and was quite dirty. I ended up installing stainless-steel lines and DOT 4 fluid. This may be overkill for your average DD, but wont hurt to go high quality and you can decide.
a bottle of brake fluid is about $10 if that, just bleed the system in your garage
Just remember to suck out as much of the old fluid out of the reservoir as possible so you don't have to pump all the old crap through the system. Not necessary but it'll speed the process up.