What is a CV Axle and what is their function on my vehicle? That is a pretty common question we receive as CV Axles do not get the limelight like your brakes or engine components typically do. Simply put, CV Axles transfer the power that comes from your engine, through your transmission, and to the wheels. They are typically found in front wheel drive and all-wheel drive vehicles. CV Axles consist of bearings and a housing on each end of the component that allow it to rotate and change direction in a multitude of degrees. Of course, these components are under constant stress and being that they are metal, they need lubrication to function properly and for an extended period of time. That being said, this is why there is a rubber boot that is placed over the bearing area on both ends of the axle and is filled with grease. This boot is also the most common part to fail on the axle.
CV Axles will give a visual clue before they require repair. As we said earlier, the boot is the most common component of the axle to fail. When a boot fails, it will likely tear, and the grease from that is lubricating the bearings inside will begin to be thrown out of the boot and attach to the underside or wheel well of your vehicle as it rotates. If not repaired promptly, it will lead to axle failure.
There are a few signs to listen and look for that will tell you the CV Axles need to be repaired. A clicking noise is the most common and easily identified sign of a failing CV Axle. With even slight wear this noise is only made when the vehicle is moving and will be louder when you turn your vehicle to the left or to the right as more pressure is placed on the failing axle. Over time, the clicking noise will begin to increase as the axle continues to wear to the point of complete failure. If that happens, the vehicle will stop, as there will be no power to the wheel.
When a CV boot fails, we may be able to disassemble the axle, clean and inspect the internal components, re-grease, reassemble with a new boot and reinstall in your vehicle.
When an axle fails or is worn, it can usually be rebuilt and the boots are also replaced. When this is the case, the axle will be taken apart, thoroughly cleaned, re-machined, and assembled with new components and new boots. We offer two versions of axles. The CV PROS axle has lifetime warranty (warranted as long as you own the vehicle, parts and labor) or Economy axles (12 month 12000 mile warranty). More times than not, the customer chooses to replace the axle with a CV PROS one. The CV PROS axle does not carry a significant price increase over an Economy axle, yet they do carry a better warranty should it fail.
If you find yourself hearing the clicking noise or spot the grease on your cars underside, bring it to us, the CV Axle repair specialists in Madison, WI.