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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.
1 Each CV axle has two joints; a CV boot surrounds each CV joint, protecting it from dirt and moisture. Rocky Mountain Driveline in Denver, CO provides an overview  . CV joints are found in most front-wheel drive vehicles and some rear- and four-wheel drive vehicles. A video by Eric the Car Guy demonstrates how to replace a CV boot, including an explanation of why it makes more economic sense to replace the axle instead of just the boot.