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Old 11-09-20, 08:35 AM
Join Date: Jul 2013
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OK, we now have Shimano's own instructions and a professional bike mechanic saying don't do it.

Why not err on the side of caution?

As for the OP, the brake might be in need of a bleed, or there is some internal mechanism malfunctioning, or the reach adjust might not have been set correctly. Since the bike was purchased under warranty 3 months ago, the shop should sort it out.

Even if the brake simply needs a bleed, you have to ask why this would be so after only 3 months.
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