| 摘要 |
PURPOSE:To prevent the pressure rise of servo oil pressure exceeding a given value and also obtain given braking even a servo mechanism comes in a bad condition in a disk brake device. CONSTITUTION:A master cylinder 10 is communicated with the first chamber 16A of a wheel cylinder 16, and the first chamber 16B of a pressure-increase control valve 56 communicated with the master cylinder 10. The oil-pressure chambers 35 and 42 of the servo cylinders 30 and 32 of a cylinder body 14 are communicated with a ballance piston 50. The balance piston 50 is communicated with the second chamber 56A of the pressure-increase control valve 56, and the third chamber 56C of the preessure-increase control value 56 is communicated with the second chamber 16B of the wheel cylinder 16. The second chamber 56A of the pressure-increase control value 56 is communicated with a cut value 64, which is communicated with the master cylinder 10. |
