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Friction materials for braking applications are made of a great number of components. Mineral Roxul®1000 fibres have been widely used as a reinforcement product for such materials. Especially in NAO/non-steel disc pad applications these fibres are an important component of the new generation formulations. In this paper, specific material formulations have been tested on an inertia braking tribometer. It is shown that the NVH performances may be strongly affected by the fibre type. Especially, a rubber coating on the surface of Roxul®1000 fibres reduces the squeal of NAO/non-steel disc pads significantly. Numerical simulations of the braking system have been also developed to better understand the effect of the material. Results show that the squealing modes are selected among instable modes corresponding to coupling between the pad-disc modal frequencies in frictional conditions.