[2] A member of the Socialist Party, he ran for the 9th arrondissement of Paris in the 1983 French municipal elections, which he lost.

He was on the board of directors at ESPCI Paris and was present when Pierre-Gilles de Gennes and Georges Charpak won the Nobel Prize in Physics.

He secured 52% of the vote in the second round, defeating Pierre Lellouche, and became President of the Finance Commission.

In 2004, Bravo he was involved in a protest against the extradition of far-right Italian terrorist Cesare Battisti.

[3] With the singer Lio and the writer Fred Vargas, he formed a committee against far-right terrorism.