| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative pressure type booster device that prevents bumping noises of an auxiliary movable wall with a master cylinder piston and that of the auxiliary movable wall with a fixed wall with a simple structure. SOLUTION: This device comprises an auxiliary pressure changing chamber 51 formed with the auxiliary movable wall 53 and the fixed wall 52 mounted inside a constant pressure chamber 15 to have the auxiliary movable wall 53 abut on a second output member 43 via a first buffer member 61 when the auxiliary movable wall 53 moves forward. |
