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Analytical formulae were obtained to quickly determine the temperature level in a single disk of the multi-disk brake. They take into account the time of contact pressure increase, convective cooling on lateral surfaces of the disk, and different thermal conductivity of material in the axial and radial directions. Calculations were performed for a disk made of carbon composite material Termar-ADF. The influence of the aforementioned input parameters on the temperature of the disk during single braking was studied. It is established that the obtained theoretical results are in good agreement with the corresponding experimental data.