考過駕照的人應該都記得，在教練車上都會有一個副剎車，如果學員出現操作不當的時候，教練就會一腳把剎車踩住，將車輛停下來。這樣可以防止意外，那么副駕剎車家用有必要安裝？副駕剎車裝了影響年檢嗎？
很多人都覺得教練坐在副駕駛上非常有安全感，就算自己操作失誤了，也有人幫自己解決后續的麻煩。可考完駕照之后，我們買的汽車上卻是沒有副剎車的，所以在發生一些意外情況的時候，坐在副駕駛上的人就只能大聲地喊剎車、剎車，自己卻沒有什么辦法制止。
有些人就在想，為什么我們的私家車上不安裝一個副剎車呢？這樣發現駕駛員走神或者不能正常控制車輛的時候，副駕駛上的人就可以直接把剎車踩住，避免意外事故的發生了。既然它這么有用，為什么我們的私家車上卻不安裝呢？老司機說出原因后，讓人感覺有些意外。
副駕駛上安裝剎車確實可以避免一些意外，可是總體來說還是弊大于利的。就比如說遇到前方車輛龜速行駛的時候，駕駛員想要從旁邊趕緊超過去，但是副駕駛的人想讓車主在后面排著隊，等別人通過之后再過，這個時候兩人的意見就已經產生分歧了，如果車主使勁踩油門，可是副駕駛的人卻一腳踩了剎車，這就比較危險了。
而且如果在高速公路上行駛的時候，副駕駛的人突然踩一下剎車，不僅車主會被嚇到，就連后面的車輛也有可能會反應不過來，導致特別危險的事情發生，所以在私家車上是不能安裝這種副駕駛剎車的。若是車輛無意間被制動了，那帶來的很可能是不可逆的。
而且從車輛改裝的方面來說，增加一個副剎也是很復雜的，而且車輛以后出故障的概率也會更高，所以綜合這些方面考慮，汽車上安裝副剎車是不太實際的。所以在開車的時候，駕駛員來操控整輛汽車就可以了，如果是不熟悉車輛的情況，可以由副駕駛的人來指揮駕駛。
當然，對于教練車就必須安裝副駕駛剎車，但對于私家車安裝副剎，法條上沒有明文禁止。也就是說，車主加裝了副駕駛剎車，也是能通過年檢的。
最后提醒大家，教練車上安裝副剎車主要是因為大家都是新手，所以很容易會出現失誤，也是為了在發生危險的時候能讓教練及時制止。拿到駕照之后，大家對汽車也已經基本熟悉了，也就沒有必要裝了，而且安裝的隱患確實很大。
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