FRICTION MEMBER, FRICTION MATERIAL COMPOSITION FOR LOWER LAYER MATERIALS, LOWER LAYER MATERIAL, DISC BRAKE PAD AND AUTOMOBILE

摘要

The present invention provides a friction member (such as a disc brake pad) which is reduced in weight by reducing the weight of a back plate, and which has improved durability after repeated braking. This friction member is specifically obtained by arranging a friction material (an upper layer material) on one surface of a back plate, which contains a material that has a lighter specific gravity than steel, with a lower layer material being interposed therebetween; and the lower layer material contains particles that have pores.