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For some clarity: "ceramic" is simply a class of materials- a large class. It could mean sapphire (very hard) or it could mean glass (potentially soft). In addition and as was pointed out, matrixing a hard material in a softer one is a great way to tune its properties of interest including friction and thermal conduction and capacity.
Lesson is, you can't really assume a ceramic brake pad is going to be harder or softer than a metal matrix one - it depends on how the engineers designed either.
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