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Centering Brakes(4 posts)

Centering BrakesPeter
Aug 15, 2001 9:03 AM
My Shimano side-pull brakes have become so off-center that the centering screw is barely hanging on. How do I get the thing re-centered so the screw doesn't fall out? Thanks.
Easy procedureBipedZed
Aug 15, 2001 1:51 PM
First, make sure your pads are wearing evenly and check if they need replacement.

Depending on your brake cable adjustment, you may want to disconnect the brake cable and reattach after centering. Also make sure the quick release on the caliper is closed.

1. Using a 5mm hex wrench, loosen the brake binder bolt (where caliper attaches to frame/fork).

2. Screw in the centering screw all the way, and then back it out about half-way so you have room for adjustment.

3. Squeeze the pads against the rim and while holding the pads against the rim tighten the brake binder bolt tight, but not so tight that the calipers start to move with the wrench.

4. Fine tune the pad centering with the centering screw.
try this:alex the engineer
Aug 16, 2001 3:49 AM
using a cone wrench, find the flats behind the caliper, and twist until centered. That's all there is to it. Of course, screw the centering screw in, too.
I disagree (to a point)Spoke Wrench
Aug 18, 2001 5:53 PM
I object to calling the screw on one of the brake arms a "centering screw." It's real purpose is to equalize the spring tension on the return springs. The idea is to adjust this screw so that both brake arms move inward together when you pull the brake lever and release together when you release it.

Use the mounting bolt if you need to center the caliper in the frame. Use the spring adjuster screw when you need to adjust the brakes so that the two arms work together and don't drag.