Excellent Marcin. Top class workmanship and write-up 
One rear caliper upgrade I've seen is to use a custom bracket to retain the EPB as parking brake only with a regular hydraulic caliper. This was on a C6 S6
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Matt
2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
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