I installed new brake calipers and pads (Koolstops also) on my bike the other day. Both brakes squeak now, actually screeching is more appropriate. I didnt have time to tweak them at that point so I thought I'd put up with it for a day or two. Aside from the embarrassment of the loud screeching I did notice there was at least one positive side-effect. People take notice! Whistles and bells work ok, sort of, and " on your left" sometimes confuses people. When it comes to squealing brakes you instinctually know someone is applying the brakes and you react. So, yea it is embarrassing to come screeeeeeching to a stop light next to your fellow cyclists but it works great with pedestrians on the paths.