Fundamentals of vibrational processes and theoretical aspects of noise and vibration mechanisms in friction systems are outlined. The available literature data are summarized, as well as the results of the authors' research in the field of vibroacoustics of friction friction units, primarily machine brakes and transmissions, the creation and use of composite materials with improved vibroacoustic characteristics. Main approaches to vibration and noise reduction in non-stationary friction processes are considered. Particular attention is paid to the material science aspects of improving the vibroacoustic characteristics of tribo-conjugations. Designed for scientific and engineering workers specializing in mechanical engineering, the operation of various transport systems and product certification, it will also be useful for students and graduate students studying friction and vibroacoustics.