The most dominant technology for today's automotive applications is the rack and pinion steering system, commonly known as power steering. TRW Automotive is among the world's leading suppliers of rack and pinion steering systems. The conventional power rack and pinion steering gear assembly is composed of 45 or more individual components. Major components of each gear include the rack, the pinion, a valve assembly, a rack tube housing, a pinion housing, a yoke plug, flexible bellows and pressure lines.