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Never.
My Mazdaspeed 3 had it's original rear pads from 2009 up until 2015 when I hit the track for the first time and swapped for something more aggressive for the rear. Kept the original rear rotor as it was still mint.
The front pads was original form 2009 up until 2014 when I needed new pads and got new rotors to go with it. Otherwise it was never taken apart.
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