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Replacement sleeve for dual pivot brake caliper spring — image 1
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Replacement sleeve for dual pivot brake caliper spring

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dimensions taken from Shimano BR-R560, 2.6 mm OD spring wire

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Model information

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Creative Commons — Attribution — Noncommercial

What it is

It's labeled as item 5, described as a sleeve in this document for the Shimano BR-7403 brake caliper:

I got a set of BR-R560 brakes but one of them was missing this piece – they are extremely easy to lose if trying to remove them.

These plastic sleeves/bushings allow the end of the spring to translate with less friction whilst operating the brake.

Future improvements

The Shimano BR-6403 brake calipers had a special variant which featured an asymmetric sleeve intended for users to be able to toggle between low & high spring tension to compensate for high friction in the cable routing. These design files could be theoretically used to fashion similar ones if someone finds that interesting.

Here, the sleeve had the Shimano PN 81U 1700.

SI-U-001-000-00-ENG

For whatever reason, newer Shimano exploded views no longer call out this part or the spring, like in this example.

Compatibility

may fit other brakes, including other non-Shimano dual pivot calipers.

Printing

You'll almost certainly need a brim, which I removed by chucking the part in a drill & running it against a file to make it look nice.

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