Bell had a run, four hits and the two RBI; Brady Clark hit an RBI single; Mike Rivera had two hits and two RBI; and Tony Graffanino had a run and two hits for the Brewers (57-63), have split their last six games.
The winning pitcher was reliever Geremi Gonzalez (4-2).
Francisco Cordero recorded his eighth save in 10 chances since joining the Brewers in a trade with Texas last month.
The loser was reliever Damaso Marte, who sank to 0-7.
The Brewers improved to 7-1 in extra-innings games this season.
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