Key words: hydrodynamic, thermal, disc brake.

Abstract: Optimization ventilated disc brake requires a thorough knowledge of the hydrodynamics of the air flow through the ventilation ducts of the disk to determine the design to facilitate the evacuation of heat by friction pads engaging the disc. In this work we present the results of numerical simulation giving behaviors coupled hydrodynamic and thermal cooling air on the one hand, and the thermal behavior of unsteady ventilated disc, on the other hand.