Good leaders must first become good servants.
—Robert K. Greenleaf
Most SAFe teams apply ScrumXP, a lightweight team framework for effective Agile project management and product delivery flow. The Scrum Master role is assumed by a team member who has a primary responsibility to help the self-organizing, self-managing team achieve its goals. Scrum Masters do this by teaching and coaching and SAFe, implementing and supporting SAFe Principles and practices, identifying and eliminating impediments and facilitating flow.
SAFe teams can tune their process from a continuum of methods, picking the best practices from Scrum, Kanban, ...