He was elected Senator for the Oyo North constituency of Oyo State, Nigeria at the start of the Nigerian Fourth Republic, running on the Alliance for Democracy (AD) platform.
He held various positions in the Army including Acting General Officer Commanding 82 division.
[3] After taking his seat in the Senate in June 1999 he was appointed to committees on Internal Affairs, Security & Intelligence, Defense and Drug & Narcotics.
[4] During the term of the assembly, several senators switched from the AD to the ruling People's Democratic Party (PDP).
[6] In November 2009 Brimmo was appointed Chairman of Odu’a Investment Company.