Analysis of High Damping Underlayer Materials for Brake Pads and its Effects on NVH Performance

This work describes an approach to overcome squeal noise problems by increasing damping on brake pads using special designed underlayer materials. Experiments were conducted to characterize the damping properties of current and new underlayer materials and its effect on the total damping of the pads. Dynamometer tests were performed to verify the noise performance behavior of pads equipped with the different types of underlayers and physical tests were made to characterize its properties. By the end a discussion about the results is conducted to relate the physical properties of the designed materials and its results on dynamometer tests.