A system for lifting an automobile for repair thereof includes a pair of opposed posts. Each post is provided with a vertically movable carriage having arms installing section which projects in a direction parallel to the direction from which an automobile is driven into the system. A pair of swing arms are pivotally connected, at their inner ends, to each installing section. A lock gear is connected to the inner end of each arm. A disk normally engages the gear to fix the arms in their horizontal positions. The disk is connected to a vertical rod extending through a mount connected to the installing section. The rod is vertically movable. When the carriage is lowered and the rod comes into contact with a floor, the arms are unfixed.