Method of manufacturing a brazing sheet

A method of manufacturing a brazing sheet for performing brazing of an aluminum material in an inert-gas atmosphere without using flux, comprising:

• a layering process wherein a plurality of aluminum slabs are layered, the aluminum slabs including a core-material slab composed of an aluminum material and a filler-material slab composed of an Al—Si series alloy and disposed on at least one surface of the core-material slab, and wherein a clad slab is prepared in which at least one aluminum slab, from among the plurality of the aluminum slabs, disposed in the span from the core-material slab to the filler-material slab inclusive contains a metal element that oxidizes more readily than Al;
• a hot-rolling process wherein hot rolling is performed on the clad slab and a clad sheet is prepared that comprises a core material, which is composed of the core-material slab, and a filler material, which is composed of the filler-material slab and disposed on at least one surface of the core material;
• a cold-rolling process wherein one or more passes of cold rolling is performed on the clad sheet;
• and
• an etching process wherein, between passes of cold rolling in the cold-rolling process or after completion of the cold-rolling process, a surface of the clad sheet is etched using an alkaline etching solution in which the NaOH concentration is 0.05 mass % or more and 1.0 mass % or less;
• wherein:
• in the hot-rolling process, the filler material is joined to at least one surface of the core material;
• and
• in the etching process, at least an outermost surface of the filler material of the clad sheet is etched.