The failure of half-shaft boots is a relatively common occurrence in Volkswagens, but unlike other forms of part failure, this needs to be dealt with immediately. While given good maintenance practices, half-shaft boots should last a reasonable amount of time. However, they do tend to need replacing at some point or another during your VW’s lifespan. Let’s take a closer look at what half-shaft boots are and the signs that they have failed, as this will help you to deal with the issue more quickly.
Half-Shaft Boots
As with many areas of motoring, half-shaft boot is a simplified term for Constant Velocity (CV) axles. They get the same half-shaft because they span half of your Volkswagen’s width.
The CV axles are essential for vehicles which use front-wheel drive, as they are needed to move power from the engine to the drive wheels. The CV axles use two joints to make this transfer less taxing, particularly when the suspension is moving or the vehicle is cornering. If these joints were not present, then the axle would likely snap from the pressure exerted upon it by a deep pothole or tight corner.
In order to protect the axle, the CV joints need some protection. They need to remain well-lubricated so they can move easily but also need to be covered to prevent contamination from dirt or debris. The CV boot or half-shaft boot is what protects the CV joints. The boots are made of strong rubber and are designed to take a beating. However, they are not designed to last forever and will likely start to fail at around the 100,000 mile mark.
While wear and tear is usually the leading reason why the half-shaft boots fail, certain factors may accelerate the deterioration of the parts. Exposure to extreme elements, such as high heat, snow, rough terrain, and poor road conditions can all cause your half-shaft boots to fail prematurely.
When the CV boots start to degrade or rip, they no longer perform their important purpose and leave the CV join exposed to dirt and debris. This build up can result in excessive vibrations, which not only causes the boot to fail further but also increases the strain upon the joints, which becomes a dangerous chain reaction.
How to Tell if your Volkswagen has Half-shaft Boot Failure
If your VW has developed CV joint problems due to failed half-shaft boots, then you may notice a few signs and symptoms that should serve as a warning. You may notice a clicking or grinding sound or feel vibrations when you turn the wheel. This shaking sensation can even run down the length of the steering wheel to the floor. A steady knocking noise while at low speeds is also a clear warning sign.
As the CV joint is always covered by the half-shaft boot, you won’t be able to tell if the joint becomes damaged. You can, however, visually inspect the half-shaft boot for signs of damage or wear. This is a check that is done by expert technicians servicing your Volkswagen and can be a good way to stay on top of any issues.
A telltale sign that the half-shaft boot is failing is leaking grease. As we mentioned, the CV joint needs grease to prevent it from seizing, and the half-shaft boot is responsible for keeping the much-needed grease in. When the rubber boot becomes worn or compromised, it won’t be able to keep the grease in the joint. You’ll be able to see evidence of a leak. Sometimes the grease will seep into the wheel rim. So, if you suddenly notice grease on one of your front tires, then you should turn your attention to the half-shaft boot.
Dart Auto for Half-Shaft Boot Repairs
Seek repairs immediately. Don’t try to drive your VW 
more than is absolutely necessary, as it is at an increased risk of broken joints or a snapped axle. This is a far more severe issue to deal with and more expensive. Don’t try to attempt repairs at home either, as CV repair can be complex and require specialist tools.
Instead, turn to our friendly team of experts at Dart Auto. We’re in the perfect spot for drivers of Englewood, Littleton, Centennial, Denver, CO. Call our customer service team today or come in to speak with one of our expert technicians regarding any problem you are having with your car.
* Volkswagen Passat Car image credit goes to: kurmyshov.
