本文件规定了在湿铺路面上用于乘用车的新轮胎在负载条件下相对于基准的湿抓地力制动性能指数的测量方法。 开发的方法旨在减少可变性。为了限制试验程序的可变性，有必要使用参考轮胎。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document specifies the method for measuring relative wet grip braking performance index to a reference under loaded conditions for new tyres for use on passenger cars on a wet-paved surface. The methods developed are meant to reduce variability. The use of a reference tyre is necessary to limit the variability of the testing procedures.All current amendments available at time of purchase are included with the purchase of this document.