The present book examines the quantitative characteristics of driver braking and pedal operation, and discusses implications to the design of braking support systems for vehicles. After the current status of the relevant research is presented through a literature review, three different methods are employed to examine driver braking microscopically, supplemented by a fourth method challenging the potential to apply the results in an adaptive brake assist system. Through a combination of naturalistic driving, test-track, and accident investigation studies, the book presents the multi-faceted nature of brake-pedal operation and its implications for future braking systems. Within this framework, the penultimate chapter is dedicated to an example application in an adaptive braking assist system.