It was the third straight win for Brazil, which lacks a medal from a major competition. Russia is the only other team without dropping a point so far. The title favourites were to take on Croatia later Wednesday.
Montenegro recorded its second win after coming back from 13-14 down at halftime to defeat Angola 30-25, marking the third straight loss for the African team.
In Group B, France and South Korea closed in on quarter-final spots, sharing the lead with five points each.
France defeated Sweden 29-17 to leave the Scandinavians waiting for their first point, while 2008 bronze medallist South Korea held defending champion Norway to a 27-27 draw.
Right back Linn Jorum Sulland's last of her 11 goals gave Norway a 27-25 lead, but Jo Hyo-bi and Ryu Eun-hee found the net for South Korea in the closing minutes.