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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.
AXLE BOOT GREASE: Axle grease is usually very dark and gritty to the feel. This is usually the result of a ruptured axle boot. The grease probably won't leak onto the ground but the back of the wheel will be very greasy. A ruptured axle boot won't disable the car immediately but it will cause the axle to deteriorate rapidly.