you can reuse the old brake pads thats not a problem at all, if your rotors were outta round (wobbly when on the brakes), youll probly find the pads wont be perfectly flat might be worn a little uneven..
best bet is IF you can, find a really thick pain of glass, put a piece of sandpaper on it and work your pads in a figure 8 motion till the whole pad face has had a rough by the sandpaper, that will insure its flat again and ready for use with a new rotor...
if you cant find a pain of glass try use something 100% flat or close too...
hope that helps!
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