This seems to be a common problem with hydraulic brakes, and seems to be caused by dirt getting stuck between the piston and caliper body.
So I was thinking, how about something like a very thin and flexible concave disk that fits between the piston and brake pad. The diameter of this disk would be larger than the piston. Wouldn't this act like a shield that keeps dirt out of the junction?
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Thread: Preventing sticky pistons?
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