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One time I installed a set of cheapie knockoff street pads and they would click when I went into reverse. Apparently these pads were cut slightly too small for the calipers and would shift in the caliper a little when backing. Once the pads were thoroughly bedded and in use there was no more movement or clicks. If the holder spring is weak or missing this might also allow a pad shift when reversing disc rotation.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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