[karolist]

You needed software to replace rear brake pads on Audis with electronic parking brake since about 2004 or whenever they introduced C6. It's not a big deal and could be done with VAG-com, but that means any small garage with mechanic who can just turn nuts and bolts won't be able to do it.

> https://www.audiworld.com/forums/a6-s6-c6-platform-discussio...

"Yes. You need vag to disable the electronic parking brake in the rear. The piston cannot be pressed into the caliper if the park brake is not disabled. "