Carvalheiro and Brazilian filmmaker Glauber Rocha met in 1972 at the Berlin Film Festival, becoming lifelong friends. Glauber Rocha became his mentor and they worked together in France, Portugal and Germany. With news of the Carnation Revolution, Carvalheiro left Paris and drove to Lisbon where he arrived four days later to welcome his close friend Glauber Rocha. Carvalheiro took part in the historic May 1 parade immortalised in the collective film "The People in Arms," co-directed by Glauber Rocha. They worked on "Free" "Lisbon", their unfinished film, shot in the days that followed the Carnation revolution.