Born in Dunedin, Drake sang in the choir of the local St Paul's cathedral, and was educated at Otago Boys' High School. He then studied at the University of Otago, where he sang with the music society. He made his opera debut in 1948 as Escamillo in Bizet's Carmen, in a production originally staged as part of the Otago Centennial, which then toured around the country.
Receiving a government bursary in 1949, Drake travelled to London. The following year he received a two-year contract as a full-time principal in the Covent Garden Opera Company. During that time he created the roles of Donald, in the 1951 world premiere of Britten's Billy Budd, and Watchful in Vaughan Williams's The Pilgrim's Progress. To cover a difficult scene change, Vaughan Williams inserted an aria specially for Drake, of which The Times critic commented: "For pure singing, there was nothing finer than the interlude between the first and second acts, in which Mr Bryan Drake sang the 121st psalm with perfect declamation and limpid purity of tone and style."
At the Welsh National Opera during the 1950s and '60s, Drake's roles included Germont in Traviata, Ferrando in Trovatore, Flint, the sailing-master, in Billy Budd, and the title roles in Nabucco and Macbeth. At Sadler's Wells, he sang Creon in Stravinsky's Oedipus Rex and Mephistopheles in Gounod's Faust.
In 1960, Britten invited Drake to sing the role of Junius in The Rape of Lucretia, at the Aldeburgh festival. Britten, known to be exacting and for dropping musicians who ceased to please him, never lost his high opinion of Drake. For the next 15 years, Drake was a regular member of Britten's English Opera Group, not only singing and recording various roles in his operas, but also performing various leading roles in operas by Malcolm Williamson, Gordon Crosse and Thea Musgrave. He also appeared in BBC television productions of Peter Grimes (as Balstrode) and Billy Budd (as Flint, a role he also recorded for Decca under the composer's baton).
In the Church Parables Britten composed between 1964 and 1968, the composer wrote roles specially for Drake in all three: the Traveller in Curlew River, the Astrologer in The Burning Fiery Furnace and the Elder Son in The Prodigal Son.
In 1972, Drake began to teach singing, first at the Guildhall School of Music and Drama. He was director of opera at the Royal College of Music from 1981 until 1985, after which he and his wife settled in Aldringham, Suffolk.  From 1987 he worked as voice consultant at the Britten-Pears School in Aldeburgh. His final performance was in 1999, when he played the Voice of God in a production of Britten's Noye's Fludde in Aldeburgh parish church.
- Keith Grant (9 April 2002). "Bryan Drake". The Guardian. Retrieved 13 May 2014.
- "NZ opera baritone Bryan Drake dies". The New Zealand Herald. 12 January 2002. Retrieved 13 May 2014.
- Elizabeth Forbes. "Drake, Bryan (Ernest Hare)", The New Grove Dictionary of Opera: Grove Music Online, Oxford Music Online, Oxford University Press, accessed 16 May 2014 (subscription required)