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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.
This type of joint is also designed to plunge in and out, and is used as the inner CV joint on most domestic front-wheel drive vehicles. All CV joints are enclosed by a rubber or hard plastic boot. The boot keeps grease in and contaminants out.