本发明的特征是,将石棉纤维和合成树脂,或在其中加入橡胶的混合体,进行压制成型,而后用电子束、离子束、或其它放射线等高能粒子线进行照射处理。作为高能粒子射线的,是以超过10~4～10~6伦琴/小时的强度进行照射的离子线、电子线、X射线、α射线、β射线、γ射线等。由于这种高能射线的照射,在刹车片中所含的、和石棉短纤维混合成型的合成树脂、橡胶等进一步交联 The present invention is characterized in that a mixture of asbestos fibers and synthetic resin, or a rubber in which rubber is added, is subjected to press-forming and then irradiated with energetic particles such as electron beam, ion beam, or other radiation. The high-energy particle beam is an ion beam, an electron beam, an X-ray, an alpha ray, a beta ray, a gamma ray, or the like irradiated with an intensity of more than 10 to 4 to 10 to 6 Roentgen per hour. Due to the irradiation of such high-energy rays, the synthetic resin, rubber and the like contained in the brake pad and molded with asbestos short fibers are further crosslinked