You're not the only one who's wondered about Brown:
www.latimes.com/sports/la-sp-plaschkela14dec14,1,2953941,full.column
Kevin Brown wasn't just a curmudgeon, he was a drug cheat.
[...]
By the time Gagne and Brown were at their Dodgers peak in the 2003 season, it was obvious to me that both players were probably on steroids.
It was obvious to the Dodgers management that both players were probably on steroids.
We would even talk about it while watching their bulging, straining bodies from the dugout during batting practice.
But the players would admit nothing, so there was nothing I could write.
Management could not subject them to testing, so there was nothing they could do.
[...]
You can no longer believe Brown's 2.39 earned-run average in 2003. More memorable will be the temper tantrums that were, perhaps, 'roid rage.