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In the present paper, simulations of a cooling-down process of an automotive disk brake system during a constant drive condition are presented in comparison with experimental data. The simulated condition was chosen because of its considerable sensitivity to the convective heat transfer changes. Performed were simulations of the air flow pattern around a passenger car with fully resolved geometry details including a brake system with pin-shaped brake disks at constant air speed. Conduction and radiation effects were considered by a fully coupled simulation between flow and thermal codes. In CFD, wheel rotation has been taken into account via MRF modeling (= Multiple Reference Frame). A validation of the underlying methodology was recently carried out by comparing characteristic mean values of cooling-down times – which indicate cooling-down behavior – to experimental values obtained in the Thermal Wind Tunnel of Stuttgart University.