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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.
Step by step guide on how to remove and replace a cv axle/joint on a front wheel drive vehicle.1  Autos & Vehicles. 2  Standard YouTube License.tep by step guide on how to remove and replace a cv axle/joint on a front wheel drive vehicle. 1  Autos & Vehicles.