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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.
Car Talk Service Advice: Drive Axle Boots. << Coolant | Drive Belts >>. The rubber cover that protects the drive axle joint is commonly known as the CV boot. Cracks or tears in the rubber can cause leaks and expose the CV joint to the elements. This is the inspection of the rubber cover that protects the drive axle joint. It's also known as the CV (constant velocity) boot, because the drive axle joint it covers is more commonly called the CV joint.