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The materials of the article consider the following issues in relation to the problem to be solved: construction of crystal lattices of metals and their parameters; assessment of the state of atoms in the crystal lattice of metal from the standpoint of molecular dynamics; stress-strain state of brake discs and hydrogen wear cells of their working surfaces. In the study of the metal friction element, a model of a multilayer atomic structure in the form of a bellows is adopted, which compresses its corrugations under the action of pulsed specific loads. When the pulse specific loads are removed, the multilayer atomic structure expands due to the internal elastic forces. The previously unknown phenomenon of formation of hydrogen-saturated zones in the near-surface layer of a metal friction element (rim, disk) of a brake device containing in its body "internal" hydrogen circulating between the layers of atoms of crystal lattices, which is that electrothermomechanical friction in a hydrogen-containing medium is the release of "external" hydrogen under pressure due to pulsed specific loads, surface temperatures and their variable gradients in the friction zones. The rate of compression is hundreds of times greater than the rate of expansion of the multilayer atomic structure. Under the action of pulsed specific loads there is a large positive flash point temperature gradient, which in the near-surface layer of the metal friction element turns into a negative surface-volume temperature gradient. This increases the pressure of the injected hydrogen, which is amplified by pulsed specific loads, compressing the multilayer atomic structure. When the pulse specific loads are removed, the multilayer atomic structure expands due to the internal elastic forces. [ABSTRACT FROM AUTHOR]