BRAKE SIGNAL TRANSMITTER, BRAKING SYSTEM, AND VEHICLE

A brake signal transmitter () includes a housing () and a liquid drainage system (). The liquid drainage system () includes an opening in the housing () and a cover () that extends over or along the opening. The cover () includes at least one aperture that allows a liquid to be drained through the cover (). The opening () of the housing () is arranged on a downward side of the housing () relative to a gravitational force the transmitter is mounted horizontally. The cover () may be a cap having a filter inserted therein. The filter may define a tortuous path to block ingress of water or debris into the housing. The cover may include resilient fingers that snap fit into a socket of the housing.