Patent ID: 6412883
Filing Date: 2002-07-02
Classification: B60T,F02D

Abstract:
A brake apparatus adapted to be provided in a vehicle having an internal combustion engine, said brake apparatus comprising:a vacuum booster having a first pressure chamber and a second pressure chamber, said first pressure chamber being connected to an intake pipe of said engine on a downstream side of an intake passage opening and closing valve, said second pressure chamber being selectively connectable to one of said first pressure chamber and atmosphere, said vacuum booster boosting an operating force applied to a brake operating member on a pressure difference between said first pressure chamber and said second pressure chamber; a braking-force assisting apparatus increasing a braking force to a value greater than a value corresponding to an output of said vacuum booster; and a throttle-opening-degree control device controlling a degree of opening of said intake passage opening and closing valve, said throttle-opening-degree control device including abnormal-time throttle-opening-degree decreasing means for decreasing the degree of opening of said intake passage opening and closing valve, when an abnormality occurs in said braking-force assisting apparatus, so as to increase a negative pressure in said first pressure chamber.