The Rack and Pinion Boot seals off the steering rack from dirt and moisture. As a result, the BMW 335i is able to have nice, smooth, precise turn-in. The Rack and Pinion Boot is located at both ends of the rack tube, which will flex with the steering motion. The boot will hold lubricant in place while blocking debris that could damage O-ring seals or chew up the inner tie-rod joint. Earlier 335i models applied a hydraulically assisted rack. This is one crucial application of resilient rubber. A leaking fluid or dirt ingress could accelerate gear wear. The Rack and Pinion Boot also plays a vital part in later electric-assist versions that don't contain high-pressure fluid. The role of the Rack and Pinion Boot stays the same for every year of the 335i for a BMW driver. Should a boot tear, the feel from the BMW steering can change from taut to gritty as contamination attacks the rack teeth, which also need replacing. Inspection of the 335i Rack and Pinion Boot at service by BMW owners can avoid an expensive rack replacement.
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