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The article analyses the results of an experimental study devoted to the impact of the mutual overlap coefficient on the friction factor of the model brake lining and brake disk in a disk brake.The mass ratio of the brake lining and brake disc models is 1:200 (the brake lining mass is 8 grams and the brake disk mass is 1,600 grams). The load level has been 0.2–0.5 N. This mass ratio and load level ensure an effective heat removal from the friction zone. The brake disk model is made of 35GS steel. The brake linings are made of two friction materials, i.e. CSiC and SCh25 cast iron. The mutual overlap coefficients for the experiments have been 0.25, 0.5, 0.75, and 1.0. It has been shown that when the mutual overlap coefficient rises from 0.25 to 1.0, there is a tendency for the friction factor to increase in the ‘SCh25 cast iron – 35GS steel’ and ‘CSiC- 35GS steel’ friction units. An increase in the friction factor by approximately 10–12% is observed for the ‘SCh25 cast iron – 35GS steel’ friction pair. An increase in the friction factor is 8–10% for the ‘CSiC- 35GS steel’ friction pair.With effective heat dissipation, the increase in the coefficient of friction occurs due to the reduction in mechanical pressures in the contact area and the increase in the number of micro-irregularities involved in the friction process. [ABSTRACT FROM AUTHOR]