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With an increase in train motion speed, the issue of improving braking systems becomes more and more important, since braking systems have a direct impact on safety of traffic. At high travel speeds, the friction elements heat up strongly, so heat dissipation from the brake discs is essential. Therefore, an important task is to study the aerodynamics of brake discs. To achieve these goals, experimental measurements on a special test bench, or simulation in specialized software packages can be used. The article discusses methods for studying air flow when braking with a disc brake. The simulation methods, turbulence models and software packages used for simulation are considered. The influence of the internal geometry of the discs on ventilation and heat dissipation is considered. Also, the geometry of the disc is analysed using simulation in the specialized software. Based on the simulation results, a conclusion about the influence of the internal disc geometry on the air flow through it is drawn.