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It is well known that improving NV performance and weight saving are reciprocity. Brake squeal free is one of the top priority issues during development of brake system. To date, complex eigenvalue analysis has been utilized for prediction of brake squeal. It solves the structural instability problems by modal coupling which is the phenomenon that natural frequencies of normal modes are quite consistent. The positive real parts of complex eigenvalues are identified as instable vibration which causes brake squeal. On the other hand, the needs for light-weight brake system are higher than before due to recent trends of economizing fuel consumption and high driving performance. In order to obtain coexistence of brake squeal free with weight saving, shape optimization technique has been proposed for complex eigenvalue analysis.

In this research, the mechanism of low-pressure brake squeal that occurs in the market recently was examined. And the effect of grease which decreases the level of brake squeal was clarified. Torque receiving face, which is the face of carrier contacting pads during braking, was focused on. It is clarified that elasticity modes of brake pads are excited because pads do not come in contact with the carrier sufficiently, and grease acts as viscous damper. To take measures against the squeal without grease, the retainer spring whose spring constant is optimized for low-pressure brake squeal, has been developed, and proved the benefit in the bench test.