This paper presents a method of noise-acoustic non-destructive control during carrying out of diagnostics of bearings of mats rolling in car wheels. The proposed non-destructive method of control provides an opportunity to check the efficiency of the selected lubricant, thereby increasing the life and performance of the bearings. A laboratory installation for the diagnosis of roller bearings has been created, which allows to obtain their acoustic parameters depending on the load of the bearing unit, the time of application, and application of different types of lubricants in bearings. The theoretical and practical contribution of this proposition is that the mathematical model developed by the authors is aimed at determining the degree of wear of bearing shafts, which allows to predict their possible work life based on the received noise-acoustic parameters.