Brake-booster device partial vacuum type for a vehicle fitted with direct braking control means

摘要

PCT No. PCT/FR93/00866 Sec. 371 Date Sep. 30, 1993 Sec. 102(e) Date Sep. 30, 1993 PCT Filed Sep. 10, 1993 PCT Pub. No. WO94/07716 PCT Pub. Date Apr. 14, 1994.The invention covers a brake-booster of the partial vacuum type comprising a direct braking control mechanism (hill-holder or traction control). In order to implement these functions, the piston (20, 22) of the booster is "double" through a partition (52) which is attached securely to the piston and defines with the piston a third chamber (50). This chamber is connected by a flexible pipe (66) and a double valve (72) either to partial vacuum (78) or to atmospheric pressure (76).