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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 Broken CV Boot. This is a view of a front, outer drive axle joint boot or âCVâ boot (stands for Constant Velocity) that has torn open. The greasy mass inside is the actual joint itself.