Every track day. But for a DD some people never change it out at all. I'd just choose a random interval if I were you. 20k, 30k, something like that. Get yourself a vacuum pump and a buddy to push the brake pedal. Don't pay for a dealer to do something easy.
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2009 370z #206 (all mods are Home Depot)
2009 Ducati 848 (full Ohlins, Termignoni, etc)
2003 Grand Cherokee (long arms, big tires, 4.56, lockers)
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