Lightly losen the lug nuts with the tires on the the ground. Jack up the car and remove the tire according to the owner's manual. Make sure to block the wheels. After the tire is removed, release the park brake. Support the car on jack stands. Remove four bolts from the rear of hub. The hub nut will be 29 mm - it is important that you have a tight fit if you attempt to remove the nut.
At this point you MAY have to loosen or remove the remove the emergency brake cable. Either way the hub is ready to be removed. The front of the hub (with the lugs) and the bearing will come out and the back plate and brake shoes will remain in place.
Once you get it off, you may either purchase a hub assembly (which includes the hub with a new bearing in place ready-to-go) or take the existing hub and a replacement bearing to an auto machine shop which can easily remove the old bearing and install the new bearing. Using extreme care you can remove the old one using bearing pullers and prybars and replace the bearing using large deep sockets or a properly sized piece of steel pipe.
Since you have the hub apart, you should inspect the brake shoes and (brake) wheel cylinders and replace them as needed. Replace brake parts on both sides if you replace them on either.
Put the hub back into the brake shoes. It may only line up one way. Finger tighten ALL FOUR of the bolts and then tighten. Replace the tire and remove the lifting equipment. Start slowly so the brakes can readjust!
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