Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. Symptoms of a Bad or Failing CV Boot

Symptoms of a Bad or Failing CV Boot

Cv Boot

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Still not sure about your car's issue?
Diagnose your car
What kind of issue are you experiencing?
Brakes are squeaking
Car is not starting
Car is overheating
Car is shaking (vibrating)
Fluids are leaking
Heating and A/C
Smoke or steam is coming out of the car
Warning light is on
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...


Related questions

Q: CV joints

There are two issues, one is whether you now have too much grease in the joint/boot and thus some will be forced out as you drive and, two, whether the two greases are chemically compatible (incompatibility is a not uncommon...

Q: Water pump needs replacing

Hello, a coolant leak should be repaired sooner than later to avoid engine damage. To check for leaks, the cooling system needs to be pressurized and inspected. If the coolant pump is found to be leaking then it will need...

Q: Need cv axel half shafts replaced.

If a mechanic shows up with an air tool to apply torque to a CV axle nut, run for the exits. The ONLY tool that can be used to tighten that nut is a carefully calibrated torque wrench, preferably one...