Patent ID: 8251462
Filing Date: 2012-08-28
Classification: B60T

Abstract:
1. A trailer braking device comprising: a trailer brake valve having a driver configured for hydraulic connection to a high-pressure main hydraulic circuit of a tractor and to a hydraulic circuit of a master brake cylinder of a tractor; the driver comprising a first chamber for regulating trailer braking pressure according to tractor braking pressure, and a second chamber connected to an independent source only when activated by means connected to a braking device of the tractor, the driver having a piston which is subjected to a first action by the independent source configured for activation by the means connected to the braking device, and a second action by an operator acting directly on the hydraulic circuit of the master brake cylinder of the tractor which results in additional pressure directly from the brake pedal of the tractor, such that the first action causes a preliminary pressure supply of fluid inside the second chamber to produce an immediate predetermined force on the trailer brake valve driver, the first action and the second action resulting in near simultaneous braking force of the tractor and trailer, the predetermined force from the first action maintained during braking.