本推荐规程的目的是在实验室中评估制动软管在暴露于高臭氧浓度环境时弯曲的效果。本推荐规程适用于所有车辆液压制动软管。这是一种加速试验，将软管置于动态臭氧暴露下。

The purpose of this recommended practice is to evaluate in the laboratory the effect of flexing on a brake hose when exposed to a high ozone concentration environment. This recommended practice is intended for all vehicle hydraulic brake hoses. It is an accelerated test which subjects the hose to dynamic ozone exposure.