During World War II, Pierre Brochard took on drawing caricatures. After the War, he joined Fleurus publishers. There, he drew for the magazines Fripounet et Marissette and Âmes Vaillantes and created his first comic series, 'Zéphyr' (1952-1963), 'Le Chevalier de Saint-Clair' and 'Théo Besagne' (text by Jean-Marie Pélaprat). At the same time, Brochard drew for other magazines, such as Coeurs Vaillants (from 1956 to 1970) and J2 Jeunes, where he created the 'Alex et Eurêka' series (again with Pélaprat).
Brochard continued his collaboration with Pélaprat with the series 'Perrac la Rapière', that was published in the magazines Formule 1 and Triolo from 1970. In 1982 he illustrated 'Sherlock Holmes' in Triolo, a story written by Didier Convard. During this period, he still drew for Fleurus, with several transitory stories of 'Fricot' and 'Éric et Lespadon', some independant stories and educational albums along with his son Philippe Brochard. Pierre Brochard has also cooperated on the magazines Francs-Jeux (from 1964 to 1973) and Tintin (the series 'Les Gens de Lameraven' from 1976).