考过驾照的人应该都记得，在教练车上都会有一个副刹车，如果学员出现操作不当的时候，教练就会一脚把刹车踩住，将车辆停下来。这样可以防止意外，那么副驾刹车家用有必要安装？副驾刹车装了影响年检吗？
很多人都觉得教练坐在副驾驶上非常有安全感，就算自己操作失误了，也有人帮自己解决后续的麻烦。可考完驾照之后，我们买的汽车上却是没有副刹车的，所以在发生一些意外情况的时候，坐在副驾驶上的人就只能大声地喊刹车、刹车，自己却没有什么办法制止。
有些人就在想，为什么我们的私家车上不安装一个副刹车呢？这样发现驾驶员走神或者不能正常控制车辆的时候，副驾驶上的人就可以直接把刹车踩住，避免意外事故的发生了。既然它这么有用，为什么我们的私家车上却不安装呢？老司机说出原因后，让人感觉有些意外。
副驾驶上安装刹车确实可以避免一些意外，可是总体来说还是弊大于利的。就比如说遇到前方车辆龟速行驶的时候，驾驶员想要从旁边赶紧超过去，但是副驾驶的人想让车主在后面排着队，等别人通过之后再过，这个时候两人的意见就已经产生分歧了，如果车主使劲踩油门，可是副驾驶的人却一脚踩了刹车，这就比较危险了。
而且如果在高速公路上行驶的时候，副驾驶的人突然踩一下刹车，不仅车主会被吓到，就连后面的车辆也有可能会反应不过来，导致特别危险的事情发生，所以在私家车上是不能安装这种副驾驶刹车的。若是车辆无意间被制动了，那带来的很可能是不可逆的。
而且从车辆改装的方面来说，增加一个副刹也是很复杂的，而且车辆以后出故障的概率也会更高，所以综合这些方面考虑，汽车上安装副刹车是不太实际的。所以在开车的时候，驾驶员来操控整辆汽车就可以了，如果是不熟悉车辆的情况，可以由副驾驶的人来指挥驾驶。
当然，对于教练车就必须安装副驾驶刹车，但对于私家车安装副刹，法条上没有明文禁止。也就是说，车主加装了副驾驶刹车，也是能通过年检的。
最后提醒大家，教练车上安装副刹车主要是因为大家都是新手，所以很容易会出现失误，也是为了在发生危险的时候能让教练及时制止。拿到驾照之后，大家对汽车也已经基本熟悉了，也就没有必要装了，而且安装的隐患确实很大。
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