Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
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As dabac, but also, if you are getting uneven wear, would investigate why, and fix this.
There is no real need to change disc pads before the get down to just before the metal of the pad shoe, however, depending of how well your brake compensates / adjusts for wear, you may want to change with less wear if you start to need to use too much lever when braking.
Contamination is another reason to replace, and also the rotor will need a good clean with IPA / disc cleaner if this happens