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I somehow missed that you had done the M/C rebuild yourself in your original post.
When you rebuilt it, did you hone the bore of the cylinder or just clean it up and install new cups? The bore gets polished inside where the cups move back and forth and this glazed surface needs to be honed out until you have a uniform "matte" surface on the full length of the bore. Otherwise the new rubber parts will not seat properly and fluid
can slip around them.
Buy a brake cylinder hone at a part store, hone the full length of the bore back and forth, then shine light into it and look for shiny areas in the bore surface . Continue this process until the entire bore surface has a uniform dull surface and all shiny areas have been eliminated. Clean and flush the abrasives out of the M/C, reinstall the new rubber parts and re-bleed everything. HTH
Bob
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