They moved for Brown, 28, ahead of Championship rivals Doncaster.
Cardiff have lost Tom Heaton to a groin injury while David Marshall needs elbowsurgery.
'Excited': Brown
Liverpool have looked at Rovers keeper Paul Robinson in case Pepe Reina leaves Anfield in the summer.
A buyer would have to meet the ?20m release clause in Reina's contract.
Kean certain his 'unsackable' tag won't be tested despite Blackburn slumpWho will beat the drop and who's heading down? Sportsmail predicts the great Premier League relegation battleAll the latest Blackburn Rovers news, features and opinionAll the latest Wigan Athletic news, features and opinion
Explore more:People: David Marshall, Paul Robinson, Pepe Reina Places: Liverpool, Cardiff
Source: Daily_Mail
