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Jupiterimages/Photos.com/Getty Images. A front axle boot, also known as a constant velocity (CV) boot, is a rubber cover that goes over the drive axle or CV joint on a car. The boot protects the joint and keeps grease used to lubricate the joint where it belongs, near the friction points.
The most frequent problem with the CV axle is when the protective boot gets ruined or cracked. If the boot is cracked or damaged, grease comes out and dirt and moisture gets in, causing the CV joint to wear out quicker, due to lack of lubrication.