2-Cyl, 1/2 HP @ 90 RPM
Join Date: Oct 2003
Bikes: 04' Specialized Hardrock Sport, 03' Giant OCR2 (SOLD!), 04' Litespeed Firenze, 04' Giant OCR Touring, 07' Specialized Langster Comp
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I had the exact same problem. It turns out that when I was hit by a cap, it knocked the caliper loose. Try this, loosen the bolts holding the brake calipers to the tab that holds onto the frame (not the bolts holding the frame itself). The caliper assembly should now have a little bit of movement. Have someone squeeze the brake pads tight (assuming they're new), then tighten the bolts. This makes sure that your pads are completely parallel to the disc.
My brakes were squeaking horribly cause it was knocked off a bit, so the very edge of the disc was always rubbing gently against one of the pads. If I tried to loosen it up so it wouldn't touch, since the contact was skewed, it took too much pull on the lever to actually brake, plus it was almost warping the disc every time.
Other than that, it just seems like there's a bit of contamination on the pad that's causing it. When the bars are turned, it is probably pulling a little on one of the cables too. Mine was actaully bad enough it would squeak really loud when riding but will be silent under braking.