Line it up

[Duke's New Chainsaw]

OK I'm trying to make a wall in the room but it's uneven. Some of it would stick out. Is there a way (a button or something) to automaticly line it up?

[NutWrench]

Try left-clicking on the brushes vertex to make the pivot point appear, then immediately right click and the vertex should snap to the nearest grid point, taking the brush with it.