Breymann became the joint professor for French and English at the University of Munich in 1875,Moniteur des dates: Biographisch-genealogisch-historisches welt ..., Volumes 7-9 by Eduard Maria Oettinger, Karl August Kesselmeyer focusing on modern language, alongside Konrad Hofmann who focused on the older forms of both languages. In 1892, Breymann became the first Professor of Romance Philology in Munich. He was at the same time a member of the royal Bavarian Supreme School Council (königlich bayerischen Obersten Schulrates). In 1876 he founded the Academic New Philogogy Club (ANV, Akademisch-Neuphilologischen Verein), and would also become a Privy Councillor. He was followed in this chair by fellow Romanist Karl Vossler in 1911.
