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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.
A CV boot is a black, accordion-like piece of rubber that covers the constant velocity joint of a car that has front-wheel or four-wheel drive. There are two CV boots on a front-wheel-drive car.