The document describes British patent GB780070 (A) from 1957 regarding improvements to vehicle couplings. It includes a detailed description of a coupling member that connects a trailer to a towing vehicle. The coupling member features a brake actuating element to engage the trailer's brakes during overrun, as well as a manually operable brake applying member. The invention aims to reduce maintenance needs and improve operation by enclosing retention means for the manually operable brake within an inverted box-like housing.