A blocked brake fluid port can extend the distance required to stop, increasing the risk of a crash.
The master cylinder internal rubber components may swell due to contamination from the brake fluid cap diaphragm, which can result in a blocked brake fluid port. As such, these motorcycles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 122, "Motorcycle Brake Systems."
What to do: Book this in with a dealer now. It affects a safety system.