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In the studies of disc brake squeal, the vibration modes on squealing were measured, and calculated [1, 2 and 3]. By those results to the disk rotor, it is clear that the specific type of the modes affect the squeal generation. It is not clear whether mounting bracket mode shapes contribute to squeal, because the mounting bracket mode shapes cannot be classified in the same way as the rotor mode shapes. In this paper, by using FEM modal analysis the vibration modes of the mounting bracket are classified systematically. And by adopting this classification to the vibration mode of mounting on squealing, it is confirmed that the specific type of modes of mounting affect the squeal generation.