| 摘要 |
PROBLEM TO BE SOLVED: To adjust brake fluid pressure boosting properly using a proportional control valve. SOLUTION: A proportional control valve 22 is arranged in a first piping system A by reversely connecting it to a line 1 ranging from a master cylinder 3 to a wheel cylinder 14, and a pump 24 is arranged in a line 23 provided in parallel with the proportional control valve 22. Also the line 21 is interconnected to a first interconnecting hole 26, the line 23 is interconnected to a second interconnecting hole 27, a line 28 is interconnected to a third interconnecting hole 29, and a first control-valve 31 is arranged in a line 28. Then, when the first control valve 31 is opened and second control valve 34 is closed, a master cylinder pressure is applied to a small diameter part 46 through the line 28 and third interconnecting hole 29. However, the master cylinder pressure excites a set spring 42 so as to change a braking point pressure. |
