| 摘要 |
PURPOSE:To always efficiently brake a vehicle regardless of the change in the weight of the vehicle, by providing a controller including a pressure control spring unit for starting the reduction in oil pressure and by providing a weight valve in the spring unit to adjust the pressure reduction start point depending on the weight of the vehicle. CONSTITUTION:Pressurized oil from the outlet ports P1, P2 of a master cylinder M is transmitted to rear wheel brakes Br, Br' through passages L1, L2. A weight valve 41 is provided between the passage L2 and a controlling oil pressure chamber 40 defined between pressure receiving pistons 92, 93. When a volume is constant, controlling oil pressure becomes high. At that time, the weight valve 40 compresses pressure control springs 121, 122 to push the pressure receiving pistons 91, 92 outwards more strongly. As a result, the point of starting of reduc tion in the pressure to the brakes Br, Br' is modified to a higher pressure point. |
