Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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It's a serrated washer. It goes between the pivot or mounting block of the brake and the frame. The serrations bite into both the brake and frame to prevent the brake from moving off center without the need for high bolt torque.
If you use this, be sure the brake is centered as you first tighten it, because it bites into both creating sort of an index effect which sometimes makes small corrections more difficult. I'm not a fan, and use coarse lapping compound (grit in grease) between the brake and frame, which gives me the bite, but doesn't cause the indexing effect.
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