Thom Andrusko

I am looking for a little help. My wife recently bought a used 2005 Audi Allroad Quattro. while she was driving the other day the rear brakes locked up. It is now in my driveway on jackstands, with the car in drive only front wheels spin. I bled the rears to no avail pads are still hard against the rotors. searching online I decided to pull the ABS module and discovered I have the bosch 5.0 not the bosch 8.0 that should be there given the info I have read. the 5.0 module cannot be removed from the pump because it has two wires permanently connected to the pump. to confuse me further with the module off of the pump the brakes are still locked. I am looking for any help or suggestions.