hold on... ignore that last post... The same exact thing happened to my dad once. The problem is that your brake booster is jamming up due to the rubber seals being eaten up by a non-Audi brake fluid. The audis brake parts are made specifically and using the wrong fluid will cause the booster's seals to literally seize the internal piston, therefore there will always be some pressure in the brake system. It is most likely that your brake booster is ruined....
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