This paper examines how affirmative action in Brazilian public universities has evolved from the start of the new millennium up to recent years. After an overview of the existing policies in public universities, we explain these patterns based on an analysis of the processes internal and external to the universities. Although these policies were initially thought of as racial quotas, class-based criteria have predominated, while the racial criteria became relatively circumscribed. Within the institutions, affirmative action brought new concerns about how to support and retain low-income students, as well as a discussion about racism, although the latter remains controversial.