PURPOSE: To prevent generation of rusts on the surface of a backing by adhering a friction material on the surface of this film after a metallic salt phosphate film having the specified film thickness is formed on the surface of the backing, and to maintain the excellent adhesive strength between the bakcing and the friction material for a long time.

CONSTITUTION: A disc brake pad basically consists of a backing and a friction material. The backing is formed of metal. On the other hand, the friction material is formed out of a binding material composed of thermosetting resin of reinforced fiber, phenol resin or the like and a filler of graphite, barium sulfate or the like. In this case, metallic salt phosphate film whose film thickness is 5-20μm is formed on the surface of the backing. The friction material is adhered on the surface of metallic salt phosphate film through the adhesive or the like, or in a direct manner. This arrangement prevents generation of rusts on the surface of the backing and maintains the excellent adhesive strength between the backing and the friction material for a long time.