The move will save Baltimore $900,000 against this year's salary cap. Brown, 35, was scheduled to earn $2.75 million in 2006.
Known as "Zeus" because of his size, the 6-foot-7, 365-pound Brown signed a five-year $17.5 million contract in 2004 that included a $4 million signing bonus. He was scheduled to make base salaries of $3.46 million in 2007 and $4.3 million in 2008.
He was placed on injured reserve in December after injuring his back in a car accident. He started nine games, but eventually lost his job to Tony Pashos after rotating during the first half of the season.
Before rejoining the Ravens in 2003 after a three-year absence from the league, Brown received a multimillion dollar settlement from the NFL to settle a personal injury lawsuit. In 1999, he was struck in the eye by a referee's penalty flag while playing for the Cleveland Browns.