| 摘要 |
PURPOSE:To aim at improvements in braking efficiency, by bypassing a braking hydraulic pressure regulating valve at a time when a rear-wheel driving system and a front-wheel driving system are in a state of being directly connected, and making braking hydraulic pressure in a master cylinder so as to act on a wheel cylinder of rear wheels in keeping this pressure intact. CONSTITUTION:When a front-wheel driving system and a rear-wheel driving system are in a state of being directly connected, a controller 13 outputs a driving signal to a solenoid 74. With this signal, the solenoid is energized with a continuous rating current whereby a valve elemet 75 is moved to some extent against a spring 76 and separated from a seat surface 77. As a result, a bypass circuit ranging from a hydraulic chamber 69 to another hydraulic chamber 68 via passages 71, 72 and 73 is opened. Therefore, these hydraulic chambers 68 and 69 are in a state of being interconnected via the bypass circuit, so that braking hydraulic pressure in a master cylinder will act on a wheel cylinder for rear wheels as it is. |
