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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 CV joints are found in most front-wheel drive vehicles and some rear-and four-wheel drive vehicles. 2  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. Some shops include a wheel alignment ($20-$400) in the cost of a CV boot/axle replacement, and others charge extra for it. 2  A wheel alignment is not necessarily required after a CV boot/axle replacement, but the conditions that caused problems with the CV boot/axle may have affected the alignment.