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A common item is to use a titanium plate between the pad and pistons- Stoptech sells these. The use of the ceramic is likely an attempt at insulating heat transfer and thereby reducing the likelihood of boiling the fluid. Since these "pads" were prototypes, did they use the oem backing plate? If not, check the measurements against an OEM backing plate for variance. Also check on how well they were retained while and when installed- it happens.
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