See Figures 1 and 2
The front halfshafts on All Wheel Drive (AWD) vehicles use CV (Constant Velocity) joints to transmit power from the differential to the front wheels, while still allowing for suspension travel. The joints are protected by CV-boots which should be checked for damage each time the oil is changed and any other time the vehicle is raised for service. These boots keep water, grime, dirt and other damaging matter from entering the CV-joints. Any of these could cause early CV-joint failure which can be expensive to repair. Heavy grease thrown around the inside of the front wheel(s) and on the brake caliper/drum can be an indication of a torn boot. Thoroughly check the boots for missing clamps and tears. If the boot is damaged, it should be replaced immediately. Please refer to Drive Train for procedures.