| 摘要 |
PURPOSE:To reduce the amount of variation in hydraulic pressure at the time of braking by providing a first solenoid valve between a master cylinder and a modulator and also providing a pressure reducing chamber between said modulator and a caliper through a branch pipe and a second solenoid valve. CONSTITUTION:When braking, if the speed of rotation of a wheel becomes lower than a set reducing speed, an electronic control part 14 closes a first solenoid valve 16 to cut off a master cylinder 4 from a modulator 8, while it opens a second solenoid valve 18 to allow pressure escape into a pressure reducing chamber 22, reducing the braking pressure being fed to a caliper 10. By cutting off the hydraulic pressure from the master cylinder 4, being sent to the modulator 8, the amount of variation in the hydraulic pressure can be reduced. Thereby, even if the modulator 8 is miniaturized and lightened, the period of the pressure fluctuation becomes shorter, preventing its function from being deteriorated. |
