Trailer or semi-trailer vehicle braking apparatus.

摘要

A fluid pressure trailer braking apparatus for two-line tractor/trailer operation has respective reservoirs (6, 7) charged via protection valves (4, 5) from the emergency/supply line (1) for connection to a tractor and respective relay valves (10, 11) each operable independently in response to the fluid pressures in a control line (2) to apply brake pressure from said reservoirs to respective brake circuits, and at least one of said relay valves has a direct emergency line connection and is arranged to operate in the manner of a relay emergency valve.