Patent ID: 6416137
Filing Date: 2002-07-09
Classification: B60T

Abstract:
A hydraulic vehicle brake system of the type having an external-force service brake system and a muscle-powered secondary brake system, comprising a master cylinder, a hydraulic pump, and a wheel brake cylinder connected to the pressure side of said pump via a pressure buildup valve and to the intake side of said pump via a pressure reduction valve, a low-pressure hydraulic reservoir connected to the intake side of the hydraulic pump, and a high-pressure hydraulic reservoir connected to the pressure side of the hydraulic pump, wherein the muscle-powered secondary brake system is disconnectable hydraulically from the wheel brake cylinder by means of an electronically triggerable valve device (30, 32), and wherein said master cylinder (28) communicates with said low-pressure hydraulic reservoir (26) and/or said high-pressure hydraulic reservoir (22) via said electronically triggerable valve device (30, 32).