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Influence of Pad Surface Texture on Disk Brake Squeal
Published October 12, 2011 by Society of Automotive Engineers of Japan in Japan
Brake squeal sometimes appears after a vehicle has been in use for years even though it wasn't generated early in the vehicle's life. In order to enable people to use vehicles for a long time with a high satisfaction level, it is important to find the factor that causes brake squeal to arise gradually because of specific changes; so we focused on the stiffness of brake pads, which are always wearing during braking, because the pads' stiffness correlates with brake squeal. This study presents the influence of pads' surface texture on disk brake squeal. The pads' stiffness with different surface texture, which we evaluated by exciting a pad at the frequency and vibration amplitude that cause brake squeal, is measured. The measurement results show that pads' stiffness increases as their surface becomes smoother, which means that the surface stiffness of pad influences the pads' stiffness. Finally, a numerical model is used to analyze the generation of squeal, which is caused by pads' surface texture.