Mercury BU2Z-2648-D Kit - Parking Brake Linings

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Whenever the brake shoes are replaced, the retractor and hold down springs should also be replaced due to the continuous heating and cooling cycle that causes them to lose tension over time, potentially leading to faster wear of the shoes. Begin by loosening the wheel lug nuts, raising the rear of the vehicle, and securely supporting it on jackstands while blocking the front wheels to prevent rolling. Release the parking brake and remove the wheel, ensuring that all four rear brake shoes are replaced simultaneously, but work on one brake assembly at a time to avoid mixing parts. If the drum is difficult to remove, retract the brake shoes by removing the rubber plug from the backing plate and using a narrow screwdriver to push the adjusting lever away from the adjusting screw star wheel, allowing the star wheel to be turned down with a brake tool. Before removing any internal drum brake components, clean them with brake cleaner and allow them to dry, using a drain pan to catch any residue. Use a brake spring removal tool to take off the shoe retracting springs, disconnect the adjusting cable, and remove the anchor pin plate along with the shoe retaining springs and pins. Pull the shoes apart, remove the adjusting screw, primary shoe, parking brake strut, and spring, then take out the adjuster pawl and secondary shoe. Separate the parking brake cable and spring from the actuating lever, and remove the retaining clip holding the parking brake actuating lever to the brake shoes. Install the parking brake actuator lever on the new brake shoe, secure it with the retaining clip, and connect the brake cable. Lubricate the adjusting screw assembly and shoe guide pads with high-temperature brake grease, position the shoes on the backing plate, and insert the retaining pins and springs. Install the retaining spring caps, ensuring proper engagement of the wheel cylinder pushrods and parking brake strut with the brake shoes. Install the adjusting screw, adjusting pawl, anchor pin plate, cable guide, and cable, followed by the shoe guide and adjusting cable eye. Connect the cable and spring to the adjuster lever, then install the drum and adjust the shoe-to-drum clearance until the shoes rub slightly against the drum, then back off the adjuster until they no longer rub. If the drum is difficult to remove, pry the rubber plug from the backing plate inspection hole and use a screwdriver and brake adjusting tool to lift the adjusting lever and rotate the adjusting screw, which will pull the brake shoes together. Spray the assembly with penetrating oil if necessary. Before reinstalling the drum, check it for cracks, score marks, deep scratches, and hard spots, which may require resurfacing at an automotive machine shop if they cannot be removed. It is recommended to resurface the drums whenever a brake job is performed to prevent out-of-round conditions. If resurfacing is not done, at least remove any glazing with medium-grit emery cloth. Install the brake drum on the hub, adjust the wheel until the brake shoes just drag on the drum, then back off the adjuster wheel. Finally, mount the wheel, install the lug nuts, lower the vehicle, and make several forward and reverse stops to adjust the brakes for satisfactory pedal action.

Block the front wheels and release the parking brake. Loosen the rear wheel lug nuts, raise the rear of the vehicle, and securely support the rear axle on jackstands before removing the rear wheels. Remove the rear disc brake pads. If the removal of the rear brake disc is hindered by the parking brake shoes, take out the rubber dust plug on the back of the anchor plate and use a brake tool to back off the shoe adjuster mechanism until the disc can be removed. Use needle-nose locking pliers to take off the shoe return springs and adjusting spring, utilizing small locking pliers for the adjusting spring and shoe return spring. Depress the shoe hold-down springs while rotating and removing the shoe hold-down pins from behind, working on only one side of the vehicle at a time until the shoes on that side are replaced. Remove the actuator and press the two shoes together to disconnect the parking brake cable eye. Take out the parking brake shoe hold-down springs and the old shoes. Examine the condition of the brake disc, including the inner surface where the rear parking brake shoes make contact; if there are hard spots or minor grooving, have the disc resurfaced at a brake service shop, and if the disc is worn beyond the thickness cast into it, replace both rear discs. Installation follows the reverse of the removal procedure; once the rear brakes are assembled, connect the left and right parking brake cables and adjust the shoes with a brake tool inserted through the adjustment hole on the backside of the assembly, then reinsert the rubber plug to prevent dirt or moisture entry.

Pry the rubber plug from the backing plate inspection hole and insert a screwdriver and a brake adjusting tool to lift the adjusting lever and rotate the adjusting screw. This will cause the brake shoes to pull together. Spray the assembly with penetrating oil and allow the oil to soak in if the mechanism is difficult to turn. The drum should now come off.

Remove the rubber dust plug on the back of the anchor plate and use a brake tool to back off the shoe adjuster mechanism until the disc can be removed.

Loosen the wheel lug nuts, raise the rear of the vehicle, and support it securely on jackstands. Block the front wheels to prevent the vehicle from rolling. Release the parking brake.

Reassemble by installing the brake caliper, ensuring the bolts are tightened. Install the wheel and tighten the lug nuts.

Check the drum for cracks, score marks, deep scratches, and hard spots. Hard spots will appear as small discolored areas. If hard spots cannot be removed with fine emery cloth or if any of the other listed conditions exist, the drum must be taken to an automotive machine shop to have it turned. Professionals recommend resurfacing the drums whenever a brake job is done.

Adjust the parking brake shoe clearance by turning the adjuster star wheel with a brake adjusting tool or screwdriver until the shoes contact the disc and the disc can't be turned. Back off the adjuster eight notches, then install the hole plug.