Brewers have a relatively quite trade deadline, adding four pitchers (two go to the minors) to help fill holes caused by various injuries to the rotation. With the bottom-ranked farm system in baseball, they have little ammo to obtain quality pieces.
Given the extremely unlikely nature of this team making a good showing in the playoffs, it would have probably been best to try to trade Grandal or Moose for some farm system reinforcements. Would not have been a good signal to the fan base, though.