Brake disc and brake disc manufacturing method

A brake disc manufacturing method, the method comprising:

• a porous metal block preparation operation for preparing a porous metal block having a plurality of pores therein;
• and
• an insert casting operation for mounting the porous metal block in a mold and casting a disc plate material to manufacture a brake disc,
• wherein the porous metal block preparation operation comprises an operation for preparing an open-cell-type porous metal block having therein a plurality of pores connected to each other and fillable with a filler,
• wherein the method further comprises:
• a filler filling operation for filling the filler in the open-cell-type porous metal block prepared in the porous metal block preparation operation, after the porous metal block preparation operation such that cast iron and the disc plate material do not permeate thereinto in the insert casting operation;
• and
• a filler removal operation for removing the filler filled in the brake disc manufactured in the insert casting operation,
• after the insert casting operation.