I'm having an issue with the Weinmann center pull brakes on my '72 Grand Sports. The front brake is fine, but the rear doesn't spring back they way the should. When I pull the brake lever everything seems fine, but the lever doesn't return to it's normal position after being released. It is definitely not an issue with the lever or wiring, it just seems like the brake's spring is not as responsive as it should be so it doesn't pull the wire back into the starting position.
I took it off and scrubbed the springs with some degreaser and that seemed to help for a day or two, but the problem has since returned. Anyone else ever deal with this or have any suggestions to remedy my problem.