After the Daimler-Motoren-Gesellschaft merged with Benz & Cie. in 1926 to form Daimler-Benz AG, the Mercedes 15/70/100 PS continued to be produced with no alterations, but was renamed the Mercedes-Benz Type 400. In 1927, the crossbeam leaf springs of the rear suspension were replaced with underslung springs. From 1928 onwards, the brake cable was supplemented by a vacuum braking system to improve brake effectiveness.