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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.
On front and all-wheel drive cars, the axle shafts are what connect the transmission with the wheels, driving the vehicle along. In order to maintain power to the wheels while allowing the wheels to turn left and right as well as travel up and down over bumps, the axles use flexible joints called CV joints. 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.