The thesis deals with the issue of brand management and brand value. Theory is applied to the example of the brand ZON, a company from Trebic producing lemonades. In the first part, the thesis is dealing with theoretical approaches to the brand management, especially the theory of David A. Aaker and Kevin Lane Keller. In the case study theory is applied to the example of lemonade company ZON. Present company identity and positioning is introduced and a current image of the brand is researched among its consumers. Finally the thesis evaluates present brand strategy and suggests changes to improve the brand value.