Patent ID: 6899403

Claim:
A braking system comprising: a hydraulically operated brake cylinder capable of operating a brake; a pressure control cylinder having a housing, a piston which is received in said housing and which is displaceable relative to said housing between front and rear stroke end positions by activation of a drive source, and a pressure controlling chamber which is located on a front side of said piston and which is connected to said brake cylinder, so that a working fluid can be supplied from said pressure controlling chamber to said brake cylinder, by displacement of said piston in a direction away from the rear stroke end position toward the front stroke end position; and a braking-pressure control device operable to control the activation of said drive source, for controlling a pressure of the working fluid in said pressure controlling chamber, so that a pressure of the working fluid in said brake cylinder can be controlled, wherein said braking-pressure control device includes: a piston-bottoming-state detecting portion operable to detect at least one of a piston-bottoming state in which said piston has reached almost in the front stroke end position while the pressure of the working fluid in said brake cylinder has not yet reached a predetermined level, and a possibility of occurrence of said piston-bottoming state; and a drive-source control portion operable to control the activation of said drive source on the basis of result of detection made by said piston-bottoming-state detecting portion.