Symptoms of a Bad or Failing CV Boot

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Constant velocity axles, commonly referred to as CV axles, are the component which transfers the power from the transmission to the wheels to propel the vehicle forward. They have a flexible constant velocity joint which allows the axle to flex in a variety of ways in order to accommodate for wheel movement created during turns and when the suspension travels.

This flexible joint is covered in a rubber boot that is referred to as the CV Boot. This boot serves as a simple dust cover for the CV joint meant to keep out dust and dirt, and keep in the grease that lubricates the CV joint. When a CV axle boot goes out, it opens up the potential for the CV joint to become damaged by contamination. Usually a problematic CV boot will produce a few symptoms that can notify the driver that attention may be required.

1. Grease leak

A grease leak is the first symptom that is most commonly associated with a bad or failing CV boot. Over time, with exposure to the elements a CV boot can become dry or brittle and crack or tear. When a CV boot cracks or tears it will usually leak grease onto the inside of the wheel. Often times the grease can also be flung onto the chassis or other parts on the underside of the vehicle as the CV axle turns. A torn boot can also allow dirt, debris, and moisture to enter the CV joint, which will damage the joint.

2. Vibrations from the CV axle

Another symptom of a bad CV boot are vibrations coming from the CV axle. The vibrations may be a result of moisture or debris getting into the CV joint and causing damage. Usually a vibrating CV axle will need to be replaced.

3. Clicking noise during turns

Another more serious symptom of a potentially torn CV boot are clicking noises from the axle during turns. This is a symptom that the CV joint has become loose to the point where play has developed, causing it to click during turns. A clicking CV joint will need to be replaced, as most CV joints are usually not serviceable.

CV boots serve a simple but important purpose and allow the CV axles and joints to stay clean and enjoy a long service life. If you notice or suspect that your CV boot may be damaged, have a professional technician, such a one from YourMechanic inspect the vehicle to determine if a CV boot replacement is appropriate, or if the entire CV joint should be replaced.


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Nicholas

10 years of experience
281 reviews
Nicholas
10 years of experience
Jeep Compass - Brakes, Steering and Suspension Inspection - Durham, North Carolina
wasn't able to fix car where it was, but provided excellent feedback and offered really good suggestions
Dodge Stratus - Brakes, Steering and Suspension Inspection - Raleigh, North Carolina
He is always on time and very professional. If he can't fix the issue he recommends what needs to be done.

Mazyar

7 years of experience
156 reviews
Mazyar
7 years of experience
Honda CR-V - Brakes, Steering and Suspension Inspection - Cumming, Georgia
A friendly, honest & professional mechanic willing to take the time to [patiently] explain the work performed/what needed to be performed!
BMW X5 - Brakes, Steering and Suspension Inspection - Norcross, Georgia
Came on time explained what is the problem and what is the solution. Ver happy with my service. Thanks

Daniel

10 years of experience
94 reviews
Daniel
10 years of experience
Honda Fit - Brakes, Steering and Suspension Inspection - Chicago, Illinois
Told me everything I needed to know and switch out after the inspection. So, I scheduled another service the next day for all the fixes, or fluid maintenance.
Ford Fusion - Brakes, Steering and Suspension Inspection - Oak Park, Illinois
Well mannered, very knowledgable professionals. Dan got my car fixed in a timely matter and I couldn't be happier with the service

Tim

11 years of experience
101 reviews
Tim
11 years of experience
Porsche Panamera - Brakes, Steering and Suspension Inspection - San Antonio, Texas
This is my second time working with Tim. He is extremely professional and punctual. the best thing about Tim is that he works quick and efficiently; handling both my issues "with time still left on the clock". I will definitely request him again the next time in need work done.

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