The return and hold down springs should be changed whenever the brake shoes are changed since the springs are subjected to constant heating and cooling and thus the spring tension reduces with time and might even drag the shoes to the drum thus wear out faster. The first thing is to loosen the lug nuts on the wheels, elevate the rear of the car and firmly hold it on jackstands without rolling the front wheels. Squeeze the parking brake and take away the wheel, inspecting the brake shoe linings, also checking the brake wheel cylinder, whether it does not have leaks, in this case, fix the brake wheel cylinder. Both rear wheels need to be changed by changing all the four brake shoes as one and not at the same time to avoid confusion of parts. Use the instructions to follow the steps of changing the brake shoes, and the correlation between the drum and the hub should be noted, to keep the balance in dynamics upon reassembling. Take out the drum retention screws, loosen the brake drum by bolts in case it is stuck and remove the drum. Put a drain pan beneath the brake assembly, spray it with brake cleaner and leave it to dry without taking compressed air. Unscrew the upper and lower return springs of the shoes and then with a hold-down spring tool or a pliers unscrew the leading and trailing shoe hold-down pins and springs and then the leading shoe. Take off the anti-rattle spring on adjuster and trailing shoe, and put high temperature grease on the points of contact of the shoe on the backing plate. On the front side depress the wheel cylinder piston and fit the leading shoe with his hold-down pin and spring, and then the lower return spring. Make sure that you put everything together, cross-check with the other side in case of doubt. In case removal of the brake drum is not easy, make sure that the parking brake has been fully disengaged and loosen the parking brake cable nut as the need be, to withdraw the brake shoes. Prior to the attaching brake drum, examine it, cracks, score marks, deep scratches and hard spots, and in case any problems are detected, go to an automotive machine shop and have the brake drum resurfaced, as this is what professional would advise every time they undertake a brake job to avoid out of round drums. When the drums are too much worn then new ones will be needed. Either run off the glaze with emery cloth or sandpaper at least. Test the brake drum Check the work of the automatic adjuster then have an assistant depress the brake pedal and test the work of the brake drum before fitting the brake drum to the axle flange. Install the wheel and the lug nuts and make sure that you place the new brake shoes so that they will not drag when you release the brake pedal. Reduce the vehicle height, screw the lug nuts to the required torque and do a few forward and back stops under the condition of the parking brake to test satisfactory pedal activity and make sure that brakes are working well before driving.