| 摘要 |
A hydraulic brake pressure control apparatus for use with a vehicle including a housing having an inlet opening connected to a master brake cylinder and an outlet opening connected to rear wheel brake cylinders, the inlet and outlet openings being normally hydraulically communicated with each other. In the housing are disposed an inertia mass member and valve means which cooperate to control the communication between the inlet and outlet openings. Also a differential piston assembly is disposed in the housing, and a spring is mounted between the piston assembly and the inertia mass member. The inertia mass member is biased by the spring to normally engage the valve means to move the latter to an open position, and displaced against the force of the spring to thereby move the valve means to a closed position when the vehicle deceleration reaches a predetermined level. The differential piston assembly detects the hydraulic pressure supplied into the housing, and is moved to compress the spring to cause the latter to exert increased force on the inertia mass member when the hydraulic pressure for obtaining the predetermined level of the vehicle deceleration is increased due to the increased load on the vehicle.
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