Technical manual for the Citroën 2 CV 4 (435 cm³) and 2 CV 6 (602 cm³) from 1970, written in French. The document details the complete specifications of the A 79/1 and M 28/1 flat-twin engines, the gearbox, the suspension system with front-rear interaction, the drum brakes, and the electrical system with alternator. It includes tables of tightening torques, capacities, front axle settings, and timing diagrams. It is a comprehensive guide to the maintenance and repair of these models.