AUTOMOBILE ENGINEERING LAB. INSTRUCTION SHEET EXPERIMENT NO. 5 Aim To study and prepare repot on the constructional details, working principles and operation of Automotive Brake Systems. a) Hydraulic and Pneumatic Brake Systems b) Drum Brake System c) Disc Brake System Theory Labelled Diagram, Constructional Details, Working Principle and Operation of the above Steering Systems PRINCIPLE It goes without saying that brakes are one of the most important control components of vehicle. They are required to stop the vehicle within the smallest possible distance and this is done by converting the kinetic energy of the vehicle into the heat energy which is dissipated into the atmosphere.