轮式工程机械因长途行驶机会少，发动机均未设排气制动装置，但在下长坡时因自身重量大，制动蹄压力高，加之散热面积小，常造成蹄片烧蚀和制动失灵，甚至发生车毁人亡的事故。为此我们尝试利用机械自身液压系统代替发动机排气制动的方法，以减少轮式机械下长坡时对制动系统的 Wheeled construction machinery due to long-distance travel opportunities, the engine is not set exhaust brake, but when the next long slope due to their own weight, high brake shoe pressure, combined with small heat dissipation area, often resulting in shoe ablation and braking Failure, or even car crash accidents. To this end, we try to use mechanical self-hydraulic system instead of engine exhaust brake method to reduce the long-wheeled wheeled machinery on the braking system