Former constables Graeme Carter and Mark Sesin kicked in the door of Donald Walker's Surrey Hills flat in 1993, because they were concerned about his girlfriend.
The judgment states that what happened in the flat is unclear, but when Mr Walker confronted the officers they assaulted both him and his elderly mother.
Mr Walker suffered numerous injuries including broken ribs, while his mother's shoulder was dislocated.
The 461-page judgment awards Mr Walker more than $1 million, his brother more than $800,000 and his mother's estate $100,000.
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