问:车闲置,粗糙,液流从电动机

一个非常坏的敲门声音最近发达在我爸爸的车。听起来好像是宽松的。几天前,当我开着他的卡车,我到他家,卡车闲置,粗糙,然后几乎关闭发动机。有一个流的流体注入运动所以我打开引擎盖,发现主制动缸的盖子是宽松的,制动液洒得到处都是。现在,卡车有一个温和的敲门声音,当我启动它。我爸爸认为他改变了石油和合成油代替常规10 w-30。所以我认为他不改变油和保持相同的,只是添加了合成油。我不知道如果这发生。他这几天有点健忘。我不知道,是什么让敲门噪音,。 Perhaps it is the brake fluid that has gotten inside the cylinder. The oil pressure lights read a bit high and my dad also told me that the truck has stalled coming up their road. Now he has no transportation and I want to fix this for him; he needs my help. We are hoping that it is a simple fix so he won't have to scrap this truck. In your experience, what will fix my dad’s truck?