Rear Brakes Locked after changing on 1998 Audi A6 Quattro

I replaced the rear Disc brake pads and rotors on my sons 1998 Audi A6 Quattro. When completed the brakes were locked up and car would move stubbornly in reverse and not at all forward. Is there some kind of adjustment to the parking brake that I missed that is needed?

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1 answer
Are these rear brakes the type that uses 2 brake shoes inside the hub of the rotor for a parking brake. If so than the parking brake needs to be adjusted correctly.