The A6 caliper is two wire, + and -, where as the A8 has a hall sensor and 4 wires in total. I guess the motor inside could be identical. I which I kept my old EPB to open up but I returned it to get the deposit back. The A6 uses 2.5mm cable and the A8 4mm. It worth taking a look to save some cash.
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Matt
2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
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