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这奔驰C级车型,在经过了6万公里之后。刹车脚感明显发生了发生了一些变化,刹车形成显著变长,刹车距离也有了很大的变化。
刹车系统由于纯机械化的程度非常高,所以逐一进行排查。采用了油液传递制动力的刹车系统,肯定是需要对刹车进行第一步检查的。评价刹车油的重要指标就是含水量,这在刹车油的桶身上也可以找到;两个数值就是 平衡回流沸点和湿平衡回流沸点。湿的意思就是值含水量达到极限时的刹车油沸点。经过测试,含水量仅仅是在1%以内,符合基本要求。
那么问题一定是出在了刹车片上面,为了更加准确的知道刹车片的厚度,我将车轮拆了下来对刹车片的厚度进行测量。
需要用到的专用工具,跟测量发动机的塞尺是一个原理。
在这个塞尺上有着明确的标注可以查看到剩余刹车片的多少,红色的晒尺代表厚度3mm,显然这样厚度已经濒临到了刹车片磨损极限边缘了。
既然已经拆卸了轮胎,也要对刹车盘进行一个基本的检查,通过卡尺即可明显的看到剩余刹车盘厚度的多少。
经过测量,刹车盘的厚度还有2***mm,而原车要求的是剩余刹车片还有25.4mm。还有一毫米厚的磨损值可以进行使用,不做更换。
将旧的刹车片拆下来之后,我把新旧刹车片放到一起进行了对比。怎么说来着,没有对比就没有伤害啊,旧的刹车片很快就会达到磨损的边缘。如果不及时的更换刹车片,用不了多久也会将刹车盘损坏的。
及时是后部的也不能幸免,马上到达极限的边缘。
此次更换的刹车片的全部配件了,前后刹车片、刹车感应报警线、固定卡片、分泵螺栓、静音膏。可以明显的见到前后刹车片的大小不一样大,主要是因为前后的制动力不一样,在踩刹车的时候,前部的车轮承担着主要的制动力,所以为了降低成本,后部的刹车片就要做的小一些。
在更换刹车片的时候有一个小细节就是一定要将新的刹车片进行倒角打磨,将新的刹车片打磨出来一个小的斜角。这样在安装的时候才不会因为和旧的刹车盘之间相互摩擦产生异响,维修手册上也是有这个要求的。
更换新的刹车片厚度要比旧的厚很多,所以为了顺利的将新的刹车片安装进去,必须要将刹车分泵进行归位。这个工具很好用,原理就是利用反向螺纹的扩张力。
打磨出来的倒角~ 看似简单,但是却有很大的作用。
在刹车片的卡位处也要进行涂抹静音膏,目的就是减小卡位在卡钳之中存在的间隙。这个间隙会导致在踩刹车的是存在一定的异响,为了消除掉异响,涂抹静音膏是一个非常不错的方式。可以理解成填补了缝隙,起到了加固和缓冲的作用。
每一个车轮都是需要进行涂抹的,无一例外。为此,我用掉了整整两包的静音膏。
安装完毕刹车片,螺栓是重中之重。无论是哪一颗螺栓,一定要用扭矩扳手上紧,更何况是对于刹车系统呢。在安装的时候扭矩扳手的位置有一些刁钻,如果用小一点的扭矩扳手会比较好用。
说一个小细节,刹车片的感应线是在刹车片上面安装的。每次更换刹车片的时候都需要对感应报警线进行更换,因为刹车线是不可以进行维护的,只能是进行更换。在前后的刹车分泵上面各有一条感应线,也有每个分泵上面都有感应线的。不过相应的是,成本也会更加的高昂。
更换了新的刹车片很可能会造成刹车脚感偏软的现象,这都是正常的。因为新的刹车片和旧的刹车盘接触面积不够大。旧的刹车盘由于日常使用的摩擦,会出现很多细小的划痕。这个划痕就会导致新的刹车片没法绝对的接触上,这就是脚感会变软的原因。所以新的刹车片需要磨合,差不多在使用500公里左右,就会恢复正常。
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原创文章,作者:cesifu,如若转载,请注明出处:http://www.cesifu.com/article/60224.html
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