Many, many years ago, I worked at a retail parts store and a guy came in with "brand new" pads that had been installed backwards, probably similar to the pic below (but both were backwards). His pad that had been facing the piston had a round cookie cutter type cut through the braking material.
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Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa
SOLD 2004 - gone but not forgotten