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Jacobs Vehicle Systems has been leading the development of engine braking technology for more than 50 years. In order to meet the need for significantly increased vehicle retarding capability, the company focused on the development of a High Power Density (HPD) braking system. Overall vehicle retarding requirements are continuously increasing due to vehicle changes that improve fuel economy, such as increases in aerodynamic efficiency and decreases in rolling resistance, which in turn, reduce the vehicle's natural retarding. This increase in overall vehicle retarding needs comes at a time when the trend is to operate at lower engine RPM's combined with downsizing of engine displacement to improve fuel economy and reduce CO₂ emissions. The smaller displacement engine will clearly produce less retarding power than the larger engine it is replacing with standard engine braking technology.