Impact analysis of contact symmetrical caliper structure on brake squeal

The brake squeal of automobiles has become one of the most annoying issues for passengers. Hence, it is essential to suppress the noise from the design stage of the braking system. In this article, the method for reducing squeal noise is explored based on the finite element model of the brake system. Studies on this model show that the structural deficiency of the brake caliper may cause the instability of the braking system and then cause squeal noise. Thus, the brake caliper is optimized to achieve a symmetrical contact pressure distribution on the inner and outer sides of the disc surface. The effectiveness of this method is analyzed by ANSYS/workbench software and verified in bench tests and road tests. The results show that the symmetrical caliper structure can make the brake pressure distribution more reasonable and the brake system more stable. Finally, it has reduced the noise incidence from 19.27% to 3.63%, which provides an effective method of reducing brake squeal noise.