What vehicle has vacuum door lock systems?

Vacuum door lock systems are commonly found in older vehicles, particularly those manufactured by American automakers like Ford, General Motors, and Chrysler during the 1970s and 1980s. These systems use vacuum pressure to lock and unlock doors, typically found in models like the Ford Mustang and Chevrolet Impala. While less common in modern vehicles, some luxury cars may still utilize similar mechanisms for enhanced security and convenience.