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To reduce brake squeal is one of the most important issues in brake development. About high-frequency brake squeal generated when the disc rotor's sliding surface vibrates In-plane direction, there are few studies and it is technically difficult to improve. In this study, we have analyzed this phenomenon and investigated methods to reduce it by both experimental analysis and FEM analysis.

In this study, influences of the unstable pad behavior on brake squeal through analysis of the pad and rotor behavior during vehicle turning operations using a large-diameter rotor were investigated. As a result, it was found that the local high pressure on the leading edge during rotor deflection caused by vehicle steering maneuvers acts as a trigger for the unstable pad behavior, and that it is important to mitigate an uneven pad pressure distribution through a shape change in order to improve anti-squeal performance.