I had the exact same issue as you described. New Brembo pads fitted a few years back which had to be trimmed to fit followed by clonking when switching from reverse to drive; however when I had my calipers recondition by Pro Calipers a few months back with new Brembo pads it completely illiminated the brake knocking noise
Tom mentioned there was a fair bit of corrosion around the plates which needed addressing on both calipers and recommended a full recon instead of just a paint job. Apparently the plate corrosion would have caused the pads to move around (I’m not an expert but he seemed to know what he was talking about). Did you have the plates removed on your units as well?
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2002 S8 - Irish Green Pearl. Cat N (saved by the D2 Doctor  )
1988 E30 Coupe - Royalblau Metallic
2003 S4 Avant - Light Silver Mettalic
2016 S5 Coupe Black Edition - Ibis White
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