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This is in a dry state, master not installed and without brake fluid, just applied a thin layer of brake grease on the o-ring and u-cup.

Hello, I am in the process of rebuilding a rear Grimeca master. I replaced the o-ring (1st groove) and the U-cup (3rd groove, closest to spring) with the open/pressure side facing the spring. My problem: after reassembling the master piston moves more or less freely and the spring pushes back the pi...