http://img473.imageshack.us/img473/9388/brewery5ae.png
This is my strategy:
After the checkpoint where i clear the brewery, climb the ladder to the second floor and have fireteam follow me. Go to the catwalk in the middle. When bravo is halfway, point the crosshairs slightly to the east on the first floor and have them cover target. Go back down to the first floor and put two mines where i indicated on the map, then go to the turret in the west and mow down everyone, then to the east and kill them, and the southeast too. After the cutscene of the chimney falling, rather than going back to the west turret, go inside and have able cover just inside the door. then go to the second floor and put claymores facing the window as i showed in the picture. Then go out the window on the THIRD floor and snipe/shoot the terrorists. After socom says to go inside go back inside quickly. Go down to the second floor corner that i showed in the picture. Detonate the claymores after socom says that they're storming in from the roof and you see the guy come in the window. You may have to shoot the guy on the third floor, it depends on how youre team is doing. After the mayhem go back your corner and shoot anyone you see. Gryce should run in right over the mines [Objective complete]. Aid your team in shooting the last 2-3 terrorists storming the brewery [Objective complete].
I hope this is helpful, I found after countless times on this one checkpoint that this is the most effective method.
Good Luck!!