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Recently high heat resistant friction materials containing synthetic fibers have been developed to meet the requirements from heavy-duty vehicle manufactures. However, traditional cut in groove process (hereafter, CIG process) cannot cut grooves on these materials clearly. Projection near groove and fuzz inside of groove exist after the CIG process. The projection and fuzz are generally considered the reason of high drag torque during idling [1]. But very little information was provided to deal with the projection and fuzz and how to reduce the drag torque caused by projection and fuzz. In this paper, various processes will be discussed to reduce drag torque and an optimized groove specification will also be proposed for high heat resistant friction materials for heavy-duty vehicles.

For vehicle transmissions, limited slip devices, and brakes employing wet friction elements, there are growing demands for improvements in reliability, performance and durability. In order to meet the requirements, it is essential to improve the paper type wet friction material applied to such mechanical devices. Remarkably, the durability of the paper is most important because it directly determines the life of the devices. This article presents advanced paper type wet friction materials which have achieved both greater heat resistance and the mechanical fatigue resistance strength, together. Additionally, this article refers to development of Non-paper type friction materials with three dimensional structure to meet the highest durability demands.