[1][2] After his education, he worked in the construction industry in different European countries.
In 1939 he was elected as a deputy member of the Landtag of Liechtenstein as a part of the unified list between the party and the Progressive Citizens' Party for the formation of a coalition government.
[1][5] During his time in the Landtag, he was a prominent opponent of the transfer of the Ellhorn to Switzerland.
[1] The community in Balzers rejected the transfer in November 1948, however it was accepted by the Landtag the following month, and finalised in 1949.
[6] From 1938 to 1950 Brunhart was a member of the board at the National Bank of Liechtenstein.