Also, there's a possibility that the braking compound just fell off the backing plate and not uneven wear/lazy piston as I first thought.
Did/can happen on motorbike brake Pads and carbon Lorraine had a major issue. By major I mean I and at least 3 local friends had issues with pad material delamination due to corrosion on the metal back plate.
@lynx started
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Also, there's a possibility that the braking compound just fell off the backing plate and not uneven wear/lazy piston as I first thought.