Patent ID: 6607254
Filing Date: 2003-08-19
Classification: B60T

Abstract:
A hydraulic brake device comprising:a cylinder; a master piston movable in the cylinder in response to operation of an output member of a brake booster in accordance with operation of a brake operation member; a floating piston having a smaller diameter than the master piston, the floating piston being engaged with the master piston and movable relative to the master piston; a master pressure chamber defined by the cylinder, the master piston and the floating piston; a brake pressure chamber defined by the cylinder and the floating piston; a valve disposed in the master piston for establishing and interrupting communication between the master pressure chamber and a reservoir tank; a valve actuating member movable relative to the output member for opening the valve when the valve actuating member is moved by a predetermined amount relative to the output member in accordance with operation of the brake operation member; and a moving amount controlling mechanism reducing the relative movement of the valve actuating member with respect to the output member in accordance with an increase of the operation force by the brake operating member.