After safely jacking the rear of the car and placing securely on stands, remove the wheel and brake drum. You may have to back off on the brake adjuster if the drum is sticking on the brake shoes. Unscrew the brake line from the cylinder, and remove the attachment bolts retaining the cylinder. Reverse the procedure to install the new cylinder. Adjust the brake shoes appropriately. Bleed the brakes until the pedal is high and hard. Lower car from stands.