The goal of this thesis is to analyze the current state of vehicle brakes construction, possibilities of measuring the brake power, braking deceleration and to analyze the influence of pipe diameter to the beginning braking force, based on data from the measuring in the dynamic cylindrical testing lab. In the first part are described braking systems and Czech and International legislation, which have to comply with all road vehicles. The section also describes ABS, the modern brake system elements and testing methods that measure the requirements of the braking effect. The next section discusses the methodology of measuring and describes the experimental cylindrical test at Czech Agricultural University in Prague. In this thesis, they are p...