The implementation of a performance metrics in the maintenance function requires the development of indicators associated with it. These indicators have, as a main component, RAMS parameters derived from physical assets. The addition of information such as costs or organizational factors sets indicators for different hierarchical levels. The article illustrates two centrifugal pumps with the development of RAMS parameters and the proposed indicators at all developed hierarchical levels based on these parameters. The need for alignment of all maintenance KPIs, based on the primitive components are RAMS parameters, with corporate objectives mark the development of metrics and the underlying problems in their implementation.