Originally posted by terra
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Another allegation I've seen is that the grease attracts dirt. Yes it's supposed to be sealed in there, but... man, there's a LOT of brake dust flying around in that area, and I've seen people claim they've noticed things get grimy in there.
I also wonder if, to the extent an un-lubed pin in a rubber guide doesn't slide, the rubber will flex. Maybe the friction is carefully calibrated for some obscure reason (damping effects? smoothing out transitions in brake application?). That's pure speculation on my part.
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