The production line in Bowling Green, Kentucky, has just been off the assembly line: Bendix completed the 3 million disc brakes for the North American commercial vehicle market. Compared to Knorr-Bremse's more than 17 million truck disc brakes worldwide, the current US market is relatively small. Nonetheless, this is still important, emphasizing the improvement of road traffic safety – a trend following the transition from drum brakes to disc brakes in the US's huge commercial vehicle market. Disc brakes: from rail to truck In the mid-1980s, Knorr was conducting an important research project. A development team is testing the limits of brake discs, calipers and friction linings on friction dynamometers. Many years ago, colleagues in the Knorr-Bremse Rail Vehicle Systems and Commercial Vehicle Systems departments worked side by side on the test bench. Thirty years ago, the engineer's mission was to develop a disc brake for commercial vehicles and expect it to be as successful as its competitors. The ultimate paradigm of technological synergy As early as the 1950s, rail vehicles used disc brakes. They have been certified as standard technology for trains and passenger cars for a long time, with advantages including excellent braking force control, short braking distance and easy maintenance. At this time, commercial vehicles use only drum brakes. How disc brakes work When Knorr began systematically developing disc brakes for commercial vehicles in the 1980s, the company was able to draw on its successful experience in the field of rail vehicles. Ultimately, all disc brakes are based on the same principle of operation: the friction disc is pressed against the disc to convert kinetic energy into heat, and effective heat dissipation to prevent overheating of the brake is one of the main challenges in developing disc brakes. Drum brake contrast disc brake Knorr-Bremse engineers know that disc brakes have a more uniform braking force than drum brakes. As trucks get faster and heavier, this will help improve handling and steering during braking. In addition, drum brakes require a higher frequency of maintenance. In today's terms, disc brakes reduce total cost of ownership (TCO). Therefore, Knorr-Bremse decided to develop disc brakes for commercial vehicles and began to promote and mass-produce in the 1980s. Synergies: two business units, one research and development center Sharing existing test equipment between the two divisions is a key factor in the success of disc brakes and a precursor to subsequent events. Since 2016, approximately 650 professional engineers and technicians from the company's two divisions have conducted interdisciplinary cooperation on 100 state-of-the-art test systems at the new Munich Development Center in Knorr-Bremse. Back to the moment, the next generation of disc brakes are called SYNACT (heavy trucks) and NEXTT (light and medium trucks and trailers), which represent digital and network. As early as the 1950s, railway vehicles began to use disc brakes. Its advantages include excellent braking force control, short braking distance and easy maintenance. Over time, people plan to replace the standard drum brakes on commercial vehicles with disc brakes. Disc brakes also produce a more uniform braking force on commercial vehicles, which helps to improve handling and steering during braking, especially for fast and heavy vehicles. Therefore, Knorr-Bremse began developing and mass-producing disc brakes for commercial vehicles in the 1980s. In our product development activities across two business units, we focus on the global megatrends of urbanization, eco-efficiency, digitization and autonomous driving. In this way, we create sustainable growth potential for the company. - Member of the Knorr-Bremse Executive Board, responsible for the commercial vehicle business Dr.Peter Laier Work together to build the future In addition to individual components, in the future, cooperation between the two divisions will be increasingly driven by megatrend solutions such as digital, eco-efficiency and autonomous driving. For example, sensors are used in collision avoidance systems. Other cross-departmental R&D collaborations include condition monitoring, remote diagnostics and predictive maintenance solutions, which were originally developed for rail vehicles but are now also used in commercial vehicles. In addition, research in the field of electric vehicles is expected to provide basic technical solutions for electric passenger cars and rail vehicles. Therefore, it is no wonder that many projects are underway: Knorr-Bremse's total investment in R&D accounts for twice as much as its peers.
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Technical synergy between Knorr-Bremse rail vehicle systems and commercial vehicle systems 
Knorr disc brake 
Member of the Knorr-Bremse Executive Board, responsible for the commercial vehicle business Dr.Peter Laier 
Synergistic effect model Knorr-Bremse rail vehicle system and commercial vehicle system realize technical synergy
In the mid-1980s: Developers were testing brake discs on a friction dynamometer in Knoll , Munich, Germany. 2019: Children in the United States are taking a safer bus to school. What happened during these 35 years? This is an attractive success story for truck disc brakes. A key reason: the technical synergy between the two major business division rail vehicle systems and commercial vehicle systems.