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Continuously increasing pressure on car manufacturers to improve the fuel economy of future vehicles lead to weight reduction considerations for all components. The reduction of the weight of brake systems requires the utilization of new materials. The use of ALMMC for rotors seems to be one solution to meet weight reduction objectives. A comparison vehicle test and lab test between conventional grey iron rotors and ALMMC rotors have indicated that aluminum rotors could become a realistic solution for weight reduction.

After successfully introducing the Mk II ABS system a new cost reduced system named ABS Mk IV went into series production in 1989. Basic principle, performance, safety aspects and comfort are similar to the Mk II system but for cost reduction reasons it has become an add-on system with vacuum boosted actuation. The system is adaptable to all base brake system layouts and can also easily be extended to traction control function.