四活塞刹车是什么意思还有卡钳是什么和碟刹有什么关系？？
推荐回答（1个）
钳刹就是刹车类似于钳子一样的，刹车时钳住轮圈，碟刹是从车轮组中间进行制动。附（非原创！）：碟型刹车系统,使用液压活塞钳压刹车片(Brake Pads)在刹车碟上,通过摩擦力消耗动能制动汽车。 如果单是需要较大的钳制力,可以使用不同的液压组件产生, 要多大力有多大力。
但光靠加大钳制力提升制动力很快达到极限, 因为制动片本身有极限摩擦力, 加上制动碟和制动片的大小不变, 增加压力产生的高温很快就会烧掉。
还有一个更早发生的问题, 是制动衰退(不一定是正确名称,可查 Brake Fading)。
这是当刹车组件温度升得过高, 制动片的材料加上液压油的变化会令制动力衰退。
如果你下坡时一直踩刹车, 你会感到需要施加的压力越来越大才能保持汽车不加速下坡, 就是这个现象。
所以提升制动力, 最好的方法是换更大的制动碟。
碟的直径大了, 卡钳径向往外移, 在同样的压力下能产生更大的制动力矩。
制动力增大, 产生的热自然也增大。
一方面大的碟可以更有效散热, 但也需要用面积更大的制动片。
制动片面积大了, 不需要更高的钳制力但需要把钳制力均匀分布。
这样便需要作多点钳制。
一般小车前制动可以用一对液压活塞卡钳，钳压制动片中央位置
所谓大四活塞刹车即使用加大的两对活塞，钳压制动片较接近两端的位置
大六活塞如此类推, 即三对，是很大的卡钳才会使用
4活塞卡钳 - 4 pot caliper
6活塞 = 6 pot
值得一提的是，更大的钳制力不等于更大的制动力，因为轮胎有极限摩擦力，制停了轮胎ABS启动，任你有多大的制动力矩作用在制动碟上，结果刹车距离还是差不多。减低刹车距离，轮胎最重要。
高规格的制动组件可以保证刹车效能的稳定性，不会出现制动力衰减，适合频繁使用重力度制动的场合。即赛车。
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