Got to clean the old grease out first, as the sand in it now has turned it into grinding paste. Will destroy that joint fast now that it is bust grinding away at the surfaces with each turn of the wheel.
This was extremely helpful it looked exactly like what I see on my wheels. Washed my wheels but that black goo/grease spilled on my wheels again but the brake fluid was not running low. After watching this I checked the boot and sure enough, it was torn.