According to the present invention, the wheel cylinder 12 is fixed to the upper end of the brake plate 10 to which the spindle is protruded to the center, and one end of each of the wheel cylinders is in close contact with each other so as to be interlocked and curved at a predetermined curvature. The shoe 14 is symmetrically supported on both sides of the brake plate, and the cylindrical brake drum 20 which is in contact with the brake shoe with its inner circumferential surface is rotatably fitted to the outer circumferential surface of the spindle. Ventilation holes are formed in the side portion and the brake plate, and through-holes are formed, and the heat dissipation fan 22 is rotatably coupled to the outer circumferential surface of the hub portion 21 of the brake drum so that the heat dissipation fan 22 can be rotated while driving. Since the air flow generated by the circulating inside the brake drum 20, the heat generated by the frictional heat during braking Lake drum a cooling unit of the vehicle brake drum 20 and the brake shoe 14 such that the brake system and that exchanges heat with outside air to be circulated, whereby the heat dissipation effect to smoothly.
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