Join Date: Jul 2013
Location: Gatton, Queensland, Australia
"CASTROL RED RUBBER GREASE
A rubber compatible grease formulated to be compatible with natural rubber components in a range of cars, light commercial vehicles and any other vehicle using rubber components, particularly brakes and clutch hydraulic mechanisms
Specifically formulated for rubber to rubber lubrication where any effects such as hardening or swelling of the rubber must be avoided. It therefore can be used on automotive hydraulic brake and clutch components where compatibility with natural rubber and SBR seals are involved. It may also be used to assist the assembly of natural and synthetic rubber components for automotive brakes or clutch systems and suspension units."
So no, there should be no adverse effects, but, Castrol makes no claim of long term compatibility with brake fluid.
I would change the fluid, just to be safe. Perhaps you "liberally" applied a little too much grease.
2010 Weestrom; 2017 Kawasaki Versys-X300; 1988 Suzuki GSXR1100