The model depicted in Fig. 1 consists of an elastically hinged (stiffness kD) rigid wobbling disk (thickness h, central moments of inertia Y, F) which represents the actual flexible brake disk (cf. [8]). The disk is in frictional contact (friction coefficient m) with idealized brake pads (mass mP 1,2). Each brake pad is elastically supported by two springs (stiffnesses k2, k3). The springs with stiffness k3 are prestressed with the force N0 guaranteeing contact between the disk and the pads. The system is driven through a visco-elastic coupling (stiffness kH, damping dH, the shaft in Fig. 1) representing the soft connection between the hub and the outer rim. The (constraint) torque MB,originating from the contact force between tire and road, ensures a constant speed of rotation OR of the outer rim. This corresponds approximately to a constant speed of vehicle provided that there is no trans latory displacement of the hub with respect to the outer rim. By this assumption the dynamics of the tire and the tire–road contact are neglected.