Abstract: The invention relates to a method for producing a brake disk (B) that comprises a supporting part (2) and a friction ring (R). The inventive method involves the following working steps: manufacturing, especially by casting, the supporting part (2) with at least one radially protruding projection (10) situated on the periphery of the supporting part; forming a cast core (14), which is made of core sand and which surrounds the projection (10) over a foot section (10a) that is assigned to the supporting part (2), onto the supporting part (2) while sealing a free end section (10b) of the projection (10) so that this end section (10b) is not made wet by the sand of the cast core (14); casting the friction ring (R) onto the supporting part (2), which is provided with the cast core (14), while casting around the free end section (10b) of the projection (10).