Brindle emigrated to New Zealand in 1910[3] or 1912,[2] and he became active with the Social Democratic Party (SDP).[2] He was jailed in 1916 during World War I for speaking out against conscription.[4][5] In 1918 he was nominated by the SDP for the Labour nomination in the Wellington South by-election, but was defeated by Bob Semple.[6] He stood for secretaryship of the New Zealand Labour Party in 1919, but withdrew and Michael Joseph Savage became the first full-time paid secretary.[7] Brindle stood again in 1920, but lost the ballot. From 1922 to 1926, he was the 6th President of the Labour Party.[2]
Brindle unsuccessfully stood five times for the House of Representatives.[3] In 1919 and 1922, he was one of three candidates in the Gisborne electorate, and he came last on both occasions.[8][9] In 1925, he was one of three candidates in the Nelson electorate, and he again came last.[10] In 1928 and 1931, he was one of three candidates in the Wellington Suburbs electorate, and he came second on both occasions.[11][12][13]
Brindle was first elected to Wellington City Council in 1933 after standing unsuccessfully several times prior[1] and remained on the city council until 1941, the same year all Labour local body members in Wellington lost their seats.[2] He was also a member of the Wellington Fire Board. He was appointed to the Legislative Council by the First Labour Government under Michael Joseph Savage and was one of 14 new appointments. At the time of his appointment, he lived in Wellington.[14]