Patent ID: 7052094
Filing Date: 2006-05-30
Classification: B60T

Abstract:
1. A vehicle brake system comprising: a master cylinder having a housing defining a bore, said master cylinder further including a boost piston and a primary piston slidably disposed in said bore, said master cylinder having a boost chamber defined at least in part by said boost piston and said housing, said master cylinder having a primary chamber defined at least in part by said primary piston; a source of pressurized fluid; and a boost valve operable to supply fluid from said source of pressurized fluid to said boost chamber for advancing said boost piston and said primary piston in said master cylinder; wherein said system includes a switchable travel rate feature such that said primary piston travels at a greater rate than said boost piston during normal boosted braking when said boost valve supplies fluid from said source of pressurized fluid to said boost chamber.