The Nissan Altima Rack and Pinion Boot is a rubber cover located at both ends of the steering rack. It protects the moving gears from dirt and debris. According to the Nissan steering arrangement, the Rack and Pinion Boot covers the rack gear where it meets the tie-rod, flexing as the gear slides so the barrier stays closed in turning of wheels. Strategically located within an Altima power-assisted rack, the Rack and Pinion Boot retains hydraulic fluid around the piston and O-ring seals for light, predictable steering effort. A tear in the Rack and Pinion Boot will allow contaminants to enter into the rack tube. This will damage the internal seal and speed up wear at the inner tie-rod joint. These issues may cause leaks, stiff wheel movement, and grinding noises. Preserving an effective Rack and Pinion Boot, therefore, protects rack gears and steering feel on all Nissan Altimas, helping the Nissan Altima steering system keep from premature damage and helping Nissan's steering system remain consistent.
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