Like his brother William, he also had a series of etchings based on Hogarth's work, and also created some caricatures for McCleary of Nassau Street, Dublin.
The frontispiece of the Proceedings of the Royal Irish Academy 1847–50 was his stipple engraved portrait of Richard Kirwan.
Brocas produced a painting of the celebrations for the visit of the viceroy Lord Clarendon to Crom castle in 1850.
[1][2][3] When his father's health declined, Brocas took over as the master of the Royal Dublin Society's School of Landscape and Ornament temporarily in May 1837.
He was replaced by Robert Lucius West in March 1838, and despite resistance from the society's fine art committee, whose preferred candidate was Andrew Nicholl, Brocas was appointed master in May 1838.