KNOWLEDGE BASE · Mechanical & electrical · Mechanical
Brake preload lock nut undoes itself / lost preload
The shiny nut surfaces have little friction between them. Put a rubber o-ring (or rubber washer/band) between the two nuts to add internal pressure — they…
- PurrPRO FORMULA PEDALS
- Updated 6 Sep 2026
The shiny nut surfaces have little friction between them. Put a rubber o-ring (or rubber washer/band) between the two nuts to add internal pressure — they stay put. This also protects the spring stack from running loose.
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