So I have a nearly-new 2008 CAAD9 frame, which I'm building up with parts off of eBay. Problem is, I've only ridden my cross bike with cantilever brakes, so I'm not entirely sure how some things go on, like the brake calipers.
Each one has 2 serrated washers, and I can't figure out if I need to install both of them. Obviously one goes between the caliper and the brake bridge, but the other one can't go on the other side of the brake bridge because it blocks the blind nut from engaging the mounting bolt. Is there some reason that I might need to stack both of them on the same side of the brake bridge? It seems like using one would yield the same result, and allow greater thread engagement between the nut and mounting bolt.