Brewer persisted in preaching, whether ordained or not, and for some years he settled at Rodborough in Gloucestershire.
He later attracted a large congregation at Sheffield, where he spent thirteen years, and ultimately settled at Birmingham, where his ministry at Livery Street was numerously attended until his death.
A spacious chapel was being built for him at the time he died, and he was buried in the grounds adjoining it.
A specimen of Brewer's preaching is printed as part of the service at the ordination of Jonathan Evans at Foleshill in 1797, and Brewer's oration at the burial of Samuel Pearce at Birmingham was printed with the sermon of John Ryland on the same occasion in 1799.
Brewer is now remembered only by a single hymn, printed with the signature of "Sylvestris" in the Gospel Magazine, 1776.