The squeal of a wheel brake with a single shoe is investigated by a beam-disk model. Resins attached to the center of a flexible beam in place of the brake shoe are pressed against the circumferential surface of a thin steel disk which rotates at a constant angular velocity. Two types of squeals were caused. One was caused by the coupling between two beam modes. Its frequency was nearly equal to the natural frequency of the beam, which was near the natural frequency of the disk. Then backward wave, forward wave components or standing wave components with stationary nodal lines are shown in the transverse disk vibration according to the relationship between the squeal frequency and the natural frequency of the disk. The other squeal was caused by the coupling of a single disk mode to a single beam mode. Its frequency was equal to the natural frequency of the disk, the damping coefficient of which is small.