Evaluation and Countermeasure Development of Brake Noise on a Motorcycle Platform

A case study was performed on a motorcycle platform to resolve customer complaint concerning Brake Noise. The Brake Noise was classically characterized in the moan and squeal frequency bands. Brake moan was present on the rear brake system, mostly in reverse, and without brake apply. The primary frequency for moan was in the range of 270 - 280 Hz. Brake squeal was confirmed at multiple frequencies on both the front and rear brakes.

The intent of this paper is to present the challenges as well as the correlation of automotive methods and countermeasures to resolve these issues. Modal analysis was performed both experimentally and analytically to establish the correlation and to define the modal coupling of individual and adjacent components. Dynamometer testing was performed experimentally by adapting and evaluating the auto industry noise screening standard procedure SAE J2521 . This procedure was used to establish a baseline reference, evaluate effectiveness of potential countermeasures and for the validation of the countermeasures for the Front and Rear brake systems.

Structural component changes were proposed and tested based on the modal analysis study for brake moan on the rear caliper mounting bracket and brake rotor. A tuned mass damper was also evaluated as a potential moan fix. Brake squeal was dramatically improved with the implementation of automotive type laminated noise dampening shims on both the front and rear brakes lining shoe plates