An apparatus for the production of a hydraulic connection and for controlling between a tractor - main circuit and the braking system of a trailer.

摘要

A device for providing hydraulic connection and control between a brake fluid circuit incorporating a pump and receiver and pertaining to a tractor, and the braking system of a trailer, comprising a body (1, 2) in which a valving member (69) is mounted mobile against a spring (67, 60) and intercepts a delivery aperture (73A) when the trailer is separated from the tractor, whereas when the trailer is connected to the tractor the valving member (69) frees said aperture (73A) and control means (20) are caused to undergo displacement to enable the pump, on braking the tractor, to raise the pressure of the brake fluid for the trailer braking system to the value required for braking the tractor.