在英文中，"刹车非常灵用"可以翻译为"the brakes are very responsive"。

这个表达来自于英文中的动词"respond"，意思是"作出反应"或"回应"。在这种情况下，"responsive"是形容词，意思是"能够迅速作出反应的"或"敏感的"。

举个例子，你可以这样说：

I'm really impressed with how responsive the brakes are on this car. (我真的对这辆车的刹车敏感度感到印象深刻。)

或者你也可以这样说：

The brakes on this bike are very responsive, which makes it easy to stop quickly in an emergency. (这辆自行车的刹车非常敏感，这使得在紧急情况下能够迅速停下来。)