I The final work refers to the analysis of pneumatic brakes of commercial vehicles, which as such are the most important parts of today's commercial vehicles. The construction of the pneumatic braking system is described and defined, the types of ABS, ASR, EBS are investigated and described. The aim of the braking systems of commercial vehicles is to ensure that the driver is safely moved and stopped. The progress of the braking systems occurred through the development of motor vehicles, which resulted in higher speeds of movement, and together with this it had to allow the driver to stop the vehicle more efficiently and safely. By analysing and investigating braking systems, in particular pneumatic systems of commercial vehicles, we come to the conclusion that the braking system of the motor vehicle must meet the conditions and requirements of the short stop path and must be reliable, which means that the braking system must ensure that the motor vehicle is stopped safely at all times, at the red light of the traffic lights or at intense braking. The focus of the work is on the analysis of pneumatic brakes of commercial vehicles. The work is conceived in several units. The introduction describes the importance of braking systems and how braking systems are activated. The second unit explains the pneumatic brakes and where they are used. The third unit describes the parts of the pneumatic brakes, and the principle of operation of the parts that make up the pneumatic braking system. The fourth unit describes the combined pneumatic-hydraulic braking system and describes its parts. The fifth unit explains the braking mechanism with the help of active braking systems, and the systems are described individually. In the sixth whole or conclusion is a brief overview of the acquired information presented throughout the work.