Brazil has announced visa exemption for nationals of 4 countries effective from Jun 17th, 2109
Nationals of Australia, Canada, Japan and the United States of America will be exempted of Visit Visas (VIVIS – Tourism / Business) as of June 17, 2019, as a result of a Brazilian Presidential Decree published on March 18, 2019.
Stays in the National territory are allowed for up to 90 days, extendable for the same period, provided that the visitor does not exceed 180 days of stay in Brazilian territory every 12 months, counting from the date of the first entry.
The official announcement from Brazil embassy is available here