3 Signs that Indicate a Failing Axle CV Shaft Assembly

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CV axles are found on almost all vehicles on the road. The function of a CV axle is to transfer power from the vehicle’s transmission and differential to the wheels of a vehicle, helping it move forward or backwards. A CV axle has flexible greased joints that allow the axle to easily flex according to the road conditions.

The grease on a CV joint is covered by a boot (sometimes called axle boot) which protects the grease from dirt and debris. CV axles are subject to a lot of stress, this is because they transfer the power from the engine to the wheels of a car. This is why they eventually wear out and need to be replaced. A CV axle can last for around 5 years or more, depending on the conditions of roads and your driving habits. Turning the car’s steering wheel to its maximum causes the boot of axle to wear off prematurely. Before a CV axle fails, it usually begins to show a few symptoms to alert the driver.

1.Clicking Sound When Turning:

CV joint
Diagram of a CV axle

This is one of the most common symptoms. An audible clicking noise can be heard when making sharp turns, when a CV axle is failing. The clicking noise tends to get louder as the axle gets faultier.

2. Leaky Axle Boot:

Leaky CV boot
Leaky CV Boot

Another symptom of a faulty CV axle is that the boot of the axle which protects the grease of the axle joint begins to leak. This grease begins to turn around as the axle turns and begins to spread all over, causing a mess. In worst cases, grease begins to touch the edges of the tire. A leaky axle boot eventually lets dirt and debris into the axle joint, which ultimately damages the axle.

3.Vibrations While Driving:

CV Joint Broken
CV axle Damaged


A bad or a faulty CV axle causes excessive vibrations when driving. If a CV joint or axle shaft is damaged, it affects the balance of a car when its wheels are rotating. The vibrations become more pronounced, as the car increases in speed. Excessive vibrations interfere with the car’s handling and ride quality. These vibrations also begin to affect a car’s suspension.

CV axles are an important component of a car, as they are the link between the engine and the wheels. This is why, it’s important for us to get them changed once these symptoms begin to surface.

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1 Comment
  1. Sultan Kiani says

    Very good advice for beginners, I usually inspect brakes, axle boot, brake lines/pipes and joints etc every week.

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