i have used brake fluid to remove scale model paint for a couple years now. and i have used it on my bike side covers as well. some paints do not come off very easily with brake fluid. but generally, the plastics i have used it on were not damaged... however... some of them are damaged by brake fluid. my side covers show no signs of melting or degrading because of brake fluid paint removal. the only sign that something was done to them is a gray surface haze.
provided you thoroughly clean the parts with dish soap and water, you should be able to neutralize the brake fluid. after you wash them, wash them again. and probably a third time before you acually paint. you want to make sure you get all the brake fluid off before you paint... otherwise you will ruin the paint from the inside, and it was all for nothing.
~mike