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Jupiterimages/Photos.com/Getty Images. A front axle boot, also known as a constant velocity (CV) boot, is a rubber cover that goes over the drive axle or CV joint on a car. The boot protects the joint and keeps grease used to lubricate the joint where it belongs, near the friction points.
What Does It Mean When My CV Axles Boots Are Leaking? The constant velocity joint axles of a vehicle are essential parts of the vehicleâs drive train. These axles transfer power from the transmission/transaxle or differentials to the wheels of the vehicle. Besides delivering power the constant velocity joint (CV) of the axle allows for flexibility while driving.