Patent ID: 6425245
Filing Date: 2002-07-30
Classification: B60T

Abstract:
A master cylinder for a hydraulic braking system of a motor vehicle, comprising:a body having a bore therein; at least one primary piston that slides in said bore, said primary piston having a compensation passage for placing a pressure chamber of the master cylinder in communication with a reservoir of fluid at a low pressure when the primary piston is located in a position of rest; a second piston located in said bore, said second piston sliding in said bore in response to an input from a control rod to interrupt said communication; a first compression spring for urging said primary piston toward a rear position of rest; a second compression spring located between said primary piston and said second piston for urging said second piston toward said rear position of rest, said first compression spring having a preload force at rest that exceeds a preload force of said second compression spring, characterized in that said rear position of rest for said primary piston and for said second piston are defined by a same stop integral with said body of the master cylinder and in that said primary piston rests on said body of the master cylinder via of at least two fingers that are uniformly spaced about an axis of symmetry of the master cylinder.