No...they just want a permanent seat on the UN Security Council, and are in competition with India & Japan for that.
Brazil, like India, is trying to stretch beyond their current "regional power" role... that is the issue, and SSNs and carriers are an integral part of that for both nations.
SSNs (and carriers) represent the ability to operate effectively beyond their own areas, and to provide major parts of multi-national coalition forces... which further enhance that perception of "more than a regional power".
Brazil is one of the main contributors to the UN regular budget, ranking 12th. Brazil maintains the world's 18th largest armed force.
Brazil has been elected nine times to the Security Council, most recently in 2004-2005.
Brazil is the 5th largest nation in the world in land area. It is also the world's tenth largest economy*, 2 slots higher than India.
Currently, India maintains the world's third largest armed force. India is the largest contributor of troops to United Nations Peacekeeping missions, but is not in the top 15 in monetary contributions.
India has been elected to the council six times in total, although the last of those was more than a decade ago, in 1991-92.
*currency-neutral GDP 2008... the World Monetary Fund & the CIA World Factbook both rank Brazil #10 and India #12, while the World Bank ranks Brazil #8 and India #12.