Spragging suggested by Spurr in 1971 is one of the major explanations on the generation mechanism of squeal. Geometric center of pressure at friction surface leading center of normal force induces instability that is explained by spragging theory. Pressure distribution is also affects thermal instability and wear. Recently, digital measurement of pressure on the brake friction surface enabled research on the relation between contact pressure and squeal propensity in situ. In this study, pressure distribution at the pad/disc interface, wear after post-fade mode and squeal noise were measured at the chassis dynamometer. The results of static and complex eigenvalue analysis were compared to the experimental results. Modified backplates to control pressure distribution result in change of the squeal propensity. It is shown that the lateral center of the pressure is proportional to the real part of the eigenvalue of the complex eigenvalue of analysis by DOE study.