The Acura MDX CV Boot protects the constant velocity joint by sealing in high-moly grease and keeping out dirt, water, and road salt that would destroy the joint in weeks. Formed from flexible rubber or later thermoplastic, the CV Boot is made to stretch with every suspension stroke and steering angle, hence allowing an uninterrupted flow of torque from transaxle to wheel. Early Acura editions featured thick rubber ribs for durability, whereas subsequent Acura MDX models transitioned to a lighter plastic that resists ozone cracking. The primary difference is the weight of materials and temperature tolerance, but both styles use tight metal clamps at each end. Each CV Boot has accordion ribs that allow it to bend without splitting and a prefilled grease pocket that helps keep the bearing moving smoothly and quietly. A torn CV Boot quickly leaks lubricant, allowing grit in to cause vibration or clicking when turning. Visual checks of the CV Boot on any Acura or any MDX are important from time to time to spot damage early. Any MDX drivetrain depends on this simple seal, and keeping the CV Boot intact will preserve the life of the joint and stop expensive axle replacement.
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