An air brake or a compressed air brake system, is a type of friction brake for vehicles in which compressed air pressing on a piston is used to apply the pressure to the brake pad needed to stop the vehicle. Air brakes are used in large heavy vehicles, particularly those having multiple trailers, which must be linked into the brake system, such as trucks, buses, trailers, and semi-trailers, in addition to their use in railroad trains. George Westinghouse first developed air brakes for use in railway service. Air brake systems are typically used on heavy trucks and buses. The air brake system has a wider application in service brakes, parking brakes, and includes wider range of components such as control pedal, an air storage tank, and various other components. The air brake system is a type of friction brake for vehicles in which compressed air pressing on a piston to put pressure in the brake to stop a vehicle. It comprises several components including compressor, governor, tank, air dryer, foot valve, brake chamber, and slack adjuster. Currently, there are two types of air brake system commonly available in the market, namely, disc air brake system and drum air brake system. The air brake system is integrated in heavy as well as commercial vehicles to apply more massive brake effort. The increased demand for air brakes has positively impacted the air brake system market.