The world's first commercially-available brake-by-wire systems arrived in early 2002, when DaimlerChrysler launched the latest version of its SL Grand Tourer, writes Anthony Lewis. The system in this vehicle was jointly developed by Bosch (assisted by the provision of Motorola components and expertise) and Mercedes-Benz, but is an electro-hydraulic, rather than a true electro-mechanical, system - and ought really be considered an interim product.