A prediction device and method for a brake system component of a brake system of a vehicle. The method includes: ascertaining value groups, which respectively have values ascertained during several braking processes of the vehicle, each comprising a braking request specification variable ascertained at a point in time, at least one brake system response variable ascertained at the same point in time, and a vehicle response variable ascertained at the same point in time; entering the ascertained value groups into coordinate systems which each has at least two axes, which respectively indicate the braking request specification variable or a braking request specification variable, the brake system response variable or at least one of the brake system response variables, and/or the vehicle response variable or a vehicle response variable; and estimating based on the coordinate systems whether an occurrence of a functional impairment of the brake system component is probable.