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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.
What should be included: 1  A constant velocity axle transmits power from the engine and transmission to drive the vehicle's wheels, allowing the axle to flex with the suspension while continuing to turn the wheels. Each CV axle has two joints; a CV boot surrounds each CV joint, protecting it from dirt and moisture.