Best Way To Remove Paint From Rubber????

A little bit of Brake Fluid will take the paint off in a hurry, just wash the pieces with some soap & water afterward.

Anybody who's ever spilled some brake fluid on a fenderwell or firewall knows what I'm talking about, it'll take the paint to bare shiny metal about as quick as you can say "Sunuva"

I've used it to remove paint from rubber components in the past, it doesn't attack/eat rubber, since a lot of stuff in your brake system is rubber (master cylinder seals and the gasket under the cap, brake hoses, wheel cylinder & caliper seals, etc)