Brazil joined the Hague Service Convention in November 2018, and it has applied since June 1, 2019. Before that, serving a defendant in Brazil meant Letters Rogatory. Brazil's Central Authority is the Ministry of Justice and Public Security, through its Department of Asset Recovery and International Legal Cooperation (DRCI) in Brasília. Brazil objected to service by mail, by judicial officers and other competent persons, and by foreign consular officers, so the Central Authority is the route.
After the Ministry accepts a request, it is sent on to the Brazilian federal courts, which carry out service and report back through the Central Authority. Every document must be in Portuguese. Because the process has several steps and Brazil receives a high volume of requests, a complete and correctly translated package from the start makes the biggest difference to timing.