The present invention relates to the technical field of trailer braking, and provides a trailer control valve and a trailer braking system. The trailer control valve includes a control port (15), a relay valve (10), an air inlet (11) and a first air outlet...

The present invention relates to the technical field of trailer control, and provides a trailer control valve and a trailer control system. The trailer control valve comprises: a relay piston and a balance piston arranged in a first chamber of the relay pi...