| 摘要 |
PROBLEM TO BE SOLVED: To heighten wheel cylinder pressure in nearly the same way as a boosting function is activated when a brake operation member is operated, in the time that the boosting function is not properly activated as running. SOLUTION: This device is provided with the second boosting device A which is prepared with a pump 9 for fail which can discharge the fluid from a master cylinder to the wheel cylinder side, a shut valve 10 of an open type arranged in a pipeline provided parallel to the pipeline, a balance valve 11 arranged within a pipeline provided parallel to the pipeline of the shut valve 10, in the piping communicating the master cylinder with the wheel cylinders. Thus, in the time of trouble, the shut valve 10 is closed and the brake can be applied, then the balance valve 11 heighten the pressure of the wheel cylinders 7, 8 for the input pressure from the master cylinder 3. |
