| 摘要 |
PURPOSE: To prevent the irritation of a driver which possibly causes a wrong operation by closing a pressure transmission chamber while an anti-lock control device is not operated, and opening a pressure medium passage when the operation is started to relief a push-rod piston in the opening direction of a brake. CONSTITUTION: The treadling force of a pedal 14 is transmitted to the inlet valve 11 of a servo unit 1 through a piston device 3 connected to the upstream side of the unit 1, and the piston device 3 is provided with a pedal-side piston 15 for adding the treadling force F of the pedal 14, a pressure transmission chamber 17, a reversing valve 18, and a push-rod piston 19 for operating the inlet valve 11 of the servo unit 1. While an anti-lock control device is not operated, the reversing valve 18 closes the pressure transmission chamber 17, and when the operation of the anti-lock control device is started, the pedal-side piston 16 is constrained, the reversing valve 18 opens a pressure medium passage from the pressure transmission chamber 17 to a pressure compensation reservoir 6 to relief the push-rod piston 18 in the releasing direction of the brake. |
