Анотация: One of the important steps in a road accident investigation is to determine the vehicle's stopping distance. Braking deceleration is one of the factors on which the stopping distance depends. In Bulgarian technical literature, information on vehicle braking deceleration is insufficient. This paper presents the results of an experimental study of the braking properties of cars. Тhe study was done with VBOX data logger equipment. Braking deceleration data for different cars during emergency braking was obtained