What happens if a CV joint boot is leaky, torn or missing?

When a CV joint boot is leaky, torn, or missing, it significantly compromises the integrity of the joint. The purpose of the CV joint boot is to protect the joint from dirt, debris, and moisture while retaining the lubrication necessary for its operation. When the boot is damaged, it allows grease to escape and contaminants to enter the joint.

This results in inadequate lubrication and increased friction within the joint, leading to accelerated wear and tear. Over time, this deterioration can cause the joint to fail completely, which may result in a loss of vehicle control and potentially costly repairs. Thus, a leaky, torn, or missing boot directly leads to the impending failure of the CV joint.