Brake system modulator with two-stage valve

摘要

A brake system includes a hydraulic module that controls fluid flow between the master cylinder and a wheel brake by means of a two-stage valve and a single release solenoid valve. The two-stage valve includes an outer poppet that carries an inner poppet both of which are normally open during base brake operation by means of an interacting piston that carries an integral ABS release orifice. During the ABS operation of the system, the inner and outer poppers are independently operable.