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The prevention of brake squeal in disc brakes is an important concern in designing a brake system because, in terms of quietness, brake squeal reduces a car's commercial value. Over the past years, many studies have been conducted to elucidate the mechanism underlying the occurrence of brake squeal. However, since disc brake squeal is a complex issue caused by the compound influence of friction phenomena and vibrations in the brake system, the problem of brake squeal still has not been completely resolved, even today. In order to propose an effective measure for the prevention of brake squeal, it is necessary to understand the nature of the brake squeal phenomenon. We have investigated the influence of the dynamic stiffness of a brake pad (hereinafter referred to as pad stiffness). The pad stiffness was evaluated the results by a pad excitation at frequencies and vibration amplitudes that would cause brake squeal.