The CV joint is packed with grease that is held in by the CV boot..... when the CV boot is cracked or torn the centrifugal force throws the grease out of the boot and the CV joint runs dry until it wears out...... that's the clunking sound you hear, usually it's when you are going around a corner at low speed..... It's a common problem with front wheel drive cars, all you can do is replace the CV joint and keep a eye on the boot..... since it is new you won't have to worry about it for awhile but it's always a good idea to keep a eye on it. Next time you see a old front wheel drive car turn a corner, listen for the Clack Clack Clack, and you will know whats wrong with it.
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