In the early 1990s, the new light models 408 (U 90) and 418 (U 110-U 140) with newly designed cabins were introduced to replace the predecessor models. The new very diagonal front portion gives the operator a good overview forward. The 408 features an asymmetric front bonnet, which is lower on the driver's side. This is supposed to permit the driver a good overview. A new ladder frame and progressively working coil springs to improve the Unimog's handling were implemented. In addition to that, the Unimog received a new tyre pressure adjustment system that can be operated whilst driving, an anti-skid system, new engines, and a "Servolock" mechanism for the hydraulic connection of implements.