Hybrid electric vehicle technology has become a preferred method for the automotive industry to reduce environmental impact and fuel consumption of their vehicles. However, the added cost of the hybrid electric system has hindered their sales. A more cost effective design of an electro-hydraulic braking system is presented. During the design process, emphasis was placed on demonstrating conceptual and system feasibility using virtual and physical prototyping. The role of prototyping in the design process is presented and discussed.