Chock the front wheels, jack up the rear of the vehicle, and support it on axle stands before removing both rear roadwheels. Fully release the handbrake lever and back off the adjustment nut to provide slack in the handbrake cable. Using a screwdriver, press down the handbrake lever on the back of the rear caliper and disconnect the inner cable, then disconnect the outer cable from the support bracket by rotating the toothed wheel to release the retaining clip. Unscrew and remove the brake caliper guide pin bolts, making a note of how the pad upper and lower support plates are fitted, as they may fall out when the pads are removed. Lift the caliper off the bracket and withdraw the two brake pads with anti-squeal shims, brushing away dirt and dust from the caliper and piston while scraping any rust from the edge of the brake disc. Measure the thickness of the friction lining on each brake pad; if either pad is worn to approximately 1 mm, renew all four pads, and replace any that are contaminated with oil or grease. If the pads are still serviceable, clean them with a fine wire brush, paying attention to the sides and back of the metal backing, and clean the pad locations in the caliper body. Apply a little copper brake grease to the areas on the pad backing plates that contact the caliper and piston, inspecting the dust seal around the piston for damage and checking for fluid leaks or corrosion. If new brake pads are to be fitted, screw the caliper piston into the cylinder to make room for them, ensuring the alignment marks on the piston and caliper are noted for correct positioning after retraction. Place the caliper over the new pads in the mounting bracket, ensuring the anti-squeal shims remain attached and the support plates are correctly positioned, then apply thread locking compound to the caliper guide pin bolts before installing and tightening them to the specified torque. Refit the handbrake lever if removed, secure the handbrake cable to the support bracket with the retaining clip, reconnect the end of the inner cable to the handbrake lever, and depress the brake pedal several times to restore normal pedal feel. Repeat the procedure on the remaining rear brake caliper, adjust the handbrake cable, refit the roadwheels, lower the vehicle to the ground, and tighten the roadwheel bolts to the specified torque, finally checking the brake hydraulic fluid level.