He was a member of the Catholic People's Party from 1975 until 1980 when this party became part of the Christian Democratic Appeal. He was a member of the House of Representatives of the Netherlands in 1977–1980, 1981–1982, 1986 and 1989. He was minister of farming and fishery in 1980–1981, and 1982–1989, and was in this function during the Chernobyl disaster.
In 1989 he was minister of education and sciences and he was minister of farming, nature management and fishery in 1989–1990. He was a member of the Senate of the Netherlands from 11 June 1991 until 10 June 2003. And as such he was parliamentary group leader in the senate from 18 June 1999 until 2 October 2001 when he became president of the Senate until 2003.
- "Gerrit Braks (CDA) nieuwe Voorzitter Eerste Kamer, Wim van Eekelen (VVD) nieuwe ondervoorzitter" (in Dutch). Eerste Kamer der Staten-Generaal. 2 October 2001. Retrieved 28 December 2010.
- "Ir. G.J.M. Braks (CDA)" (in Dutch). Eerste Kamer der Staten-Generaal. Retrieved 28 December 2010.
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- (in Dutch) Ir. G.J.M. (Gerrit) Braks Parlement & Politiek
- (in Dutch) Ir. G.J.M. Braks (CDA) Eerste Kamer der Staten-Generaal