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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.
Tagged as: car maintenance, CV Boot, CV Joint, do it yourself. bad CV boot courtesy of Audiworld.com. Constant velocity, or CV, joints, are responsible for protecting the drive axle assembly which shifts power from the transmission to the wheels of front-wheel-drive cars. Using a lug wrench, loosen the lugs on the front wheels, but do not remove. 2  Raise the front of the vehicle with a jack, and place on jack stands. 3  Remove the lug nuts, and then the front wheels. 4  You can now inspect the rubber boots of the CV joints for obvious cracks and tears.