Constant Velocity Axles commonly referred as CV Axles is a component that transfers the power from the transmission to the wheels allowing the vehicle to move forward. On the axle there is a rubber boot that is filled with grease and over time it dry cracks and rips causing grease to come out and allowing dirt and grime to contaminate other components especially the cv joint causing damage. A symptom of your axle failing would be hearing a clicking noise when turning.
If this is something you are experiencing give us a call.