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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.

In this study, we examined the relation between pad restraint condition and brake squeal generation by analyzing brake pad behavior when squeal generates. As a result, it is found that the pad restraint condition largely contribute to brake squeal, and it is indispensable to keep rigid contact for reduction of brake squeal. Therefore, stabilization of pad restraint condition is important as premise of eigenvalue optimization by comply eigenvalue analysis, which is widely adopted method for reduction of brake squeal at present time. And here we suggest a structure for its realization and report the effect.

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.

Brake noise problem is one of the most common customer complaints regarding brake systems. With a focus on low frequency squeal, we have studied the vibration modes of brake caliper. In the present study, we achieved the reduction of low frequency brake squeal through modal analysis of mounting brackets.