Actuator with safety valve for vehicle antilock braking - has electromagnetically operated reserve valve by=passed by additional valve responsive to pressure distribution in master cylinder

摘要

A vacuum-operated braking force amplifier (1) is interposed between the brake pedal (3) and the tandem master cylinder (2) supplied with fluid from a reservoir (4). To eliminate risk of loss of braking by unintentional switching of the electromagnetic reserve valve (27), the hydraulic chamber (30) can be cut off additionally by a parallel valve (28). A hydraulic control line (32) is opened by a ball valve (33) operated by the pressures obtaining in the prim. and sec. chambers (14,15) of the master cylinder (2). ADVANTAGE - Significant increase in operational reliability is guaranteed with possibility of emergency braking.