http://proudfoot-design.com/mercedes/annoying_squeeking.MOV
Here is a link to the sound my brake pedal is making. It kicks in after a couple of seconds. Let me know if this doesn't sound like the most annoying thing in the world!
I'm planning on swapping out the brake booster from Potomac but, because I'm kind of shooting in the dark, I wanted to throw this to the wind and see if anyone had any ideas as to what else could cause the squeeking before ordering the part.