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The FE analysis is one of approach to develop the reduction method for brake squeal. This study shows the results of applying the FE analysis method, developed for disc brake with opposed piston type caliper shown in reference [1] and [2], to the analysis of low frequency disc brake squeal of floating type caliper. The FE analysis results are confirmed with the vibration mode during squeal generation measured by experiment. And some effective factors to the brake squeal are clear on floating type caliper by FE analysis.

It is very important for the vehicle comfort quality to eliminate brake noise. The brake noise can be defined into two phenomena: One is the high-frequency brake squeal (frequency 1-15kHz), we have presented in 1989 SAE Congress(890864) * (2),and the another is the low-frequency brake groan (frequency 200-500Hz). In this paper,the brake groan has been discussed by constituting the theoretical model,in order to clarify the cause of disc brake groan noise. According to the previous study(3), the groan noise has been occurred by the increase of the disc temperature which has influenced on the disc width and the disc material. On the other hand, the groan noise can be observed in the condition of atmosphere temperature indeed. So that the precise phenomenon and cause should be defined. After observing the groan noise on the test bench, we have constructed the theoretical model and taken the numerical method.