In 1988, Brazilian Constitution definedhealth as a universal right and state responsibility. Progress towards universal health coverage (UHC) has been achieved through a Unified Health System (Sistema Único de Saúde, SUS) which was created in 1990. With successes and setbacks in the implementation of health programmes and organization of its health system, Brazil has achieved nearly-universal access to health services for her citizens. The trajectory of the development and expansion of the SUS offers valuable lessons on how to scale UHC in a health system in a highly-unequal country and relatively low resources. The analysis of the 30 years since the inception of SUS shows that innovations in the Brazilian health system extend beyond the development of new models of care and highlights the importance of establishing political, legal, organizational and management-related structures, and the role of the federal and local governments in the governance, planning, financing, and provision of health services. The expansion of SUS has allowed Brazil to rapidly address the changing health needs, with dramatic scaling up health service coverage in just three decades. However, despite its successes, analysis of future scenarios suggests the urgent need to address lingering geographic inequalities, insufficient funding, and the suboptimal private-public collaboration. Recent fiscal policies that ushered austerity measures, environmental, educational and health policies of the new administraion introduced in Brazil could reverse the hard-earned achievements of the SUS and threaten its sustainability and its ability to fulfil its constitutional mandate of providing 'health for all'. 2000 2010 2015 Births attended by skilled health staff (% of total) 87•6 98•6 98•9 99•1 Immunization, BCG (% of one-year-old children) 79 99 99 99 Immunization, measles (% of children ages 12-23 months) 78 99 99 96 Immunization, DPT (% of children ages 12-23 months) 66 98 99 96 Immunization, Hib3 (% of children ages 12-23 months) 90 99 96 Immunization, Pol3 (% of one-year-old children) 58 99 99 98 Immunization, HepB3 (% of one-year-old children) 94 96 96 Antiretroviral therapy coverage (% people living with HIV) 27 38 57