A liquid-cooled brake disc comprising: a substantially circular front face surface configured to brake an adjacent rotating member; a substantially circular back face surface; an outer perimeter wall extending from the front face surface to the back face surface; and at least four inner chambers , including: a first inner chamber defining a first cooling liquid pathway from a first cooling liquid inlet disposed in the outer perimeter wall to a first cooling liquid outlet disposed in the outer perimeter wall , a second inner chamber defining a second cooling liquid pathway from a second cooling liquid inlet disposed in the outer perimeter wall to a second cooling liquid outlet disposed in the outer perimeter wall , a third inner chamber defining a third cooling liquid pathway from a third cooling liquid inlet disposed in the outer perimeter wall to a third cooling liquid outlet disposed in the outer perimeter wall , and a fourth inner chamber defining a fourth cooling liquid pathway from a fourth cooling liquid inlet disposed in the outer perimeter wall to a fourth cooling liquid outlet disposed in the outer perimeter wall , wherein each of the inner chambers has a plurality of ribs ( disposed therein, and wherein each of the inner chambers is separated from adjacent inner chambers by a divider . a substantially circular front face surface configured to brake an adjacent rotating member; a substantially circular back face surface; an outer perimeter wall extending from the front face surface to the back face surface; and at least four inner chambers , including: a first inner chamber defining a first cooling liquid pathway from a first cooling liquid inlet disposed in the outer perimeter wall to a first cooling liquid outlet disposed in the outer perimeter wall , a second inner chamber defining a second cooling liquid pathway from a second cooling liquid inlet disposed in the outer perimeter wall to a second cooling liquid outlet disposed in the outer perimeter wall , a third inner chamber defining a third cooling liquid pathway from a third cooling liquid inlet disposed in the outer perimeter wall to a third cooling liquid outlet disposed in the outer perimeter wall , and a fourth inner chamber defining a fourth cooling liquid pathway from a fourth cooling liquid inlet disposed in the outer perimeter wall to a fourth cooling liquid outlet disposed in the outer perimeter wall , a first inner chamber defining a first cooling liquid pathway from a first cooling liquid inlet disposed in the outer perimeter wall to a first cooling liquid outlet disposed in the outer perimeter wall , a second inner chamber defining a second cooling liquid pathway from a second cooling liquid inlet disposed in the outer perimeter wall to a second cooling liquid outlet disposed in the outer perimeter wall , a third inner chamber defining a third cooling liquid pathway from a third cooling liquid inlet disposed in the outer perimeter wall to a third cooling liquid outlet disposed in the outer perimeter wall , and a fourth inner chamber defining a fourth cooling liquid pathway from a fourth cooling liquid inlet disposed in the outer perimeter wall to a fourth cooling liquid outlet disposed in the outer perimeter wall , wherein each of the inner chambers has a plurality of ribs ( disposed therein, and wherein each of the inner chambers is separated from adjacent inner chambers by a divider . <EOS>