Disassembly and Replacement of Rear Brake Rotor and Pads

First, lift the vehicle using a jack (position it near the wheel you need to work on) or a lift. Once the vehicle is lifted, remove the wheel lug nuts using a pneumatic wrench and take off the wheel: you will immediately notice the wear on the rotor and the significant reduction in thickness. At this point, locate the two holes on the brake caliper and, using a punch and hammer, remove the retaining pins for the pads and the retaining spring.
Using a spreader tool, push the pads apart to fully retract the piston and create space for the new pads, which will clearly be significantly thicker.
Loosen the two caliper mounting bolts located at the rear and remove the caliper to freely extract the rotor.
The rotor is attached to the hub with a hex head bolt located near one of the threaded holes for the wheel lug nuts: once the hex bolt is loosened, you can remove the rotor and notice the presence of shoes (in this case, the rotor also functions as a drum). However, before positioning the new rotor, it is advisable to clean the hub of any oxidation residues (using sandpaper or a wire brush), apply grease to prevent new rust formation, and clean the rotor itself with solvent to eliminate any residual passivating oil (this is an oil applied by the manufacturer to prevent the rotors from oxidizing during storage). Once the new rotor is applied, align the threaded hole on the hub and securely tighten the hex mounting bolt. At this point, reposition the caliper and tighten the corresponding mounting bolts. Insert the new pads (having possibly treated them beforehand with specific anti-adhesive spray), and after thoroughly brushing them, insert the upper pin, then the retaining spring (under the pin), and the lower pin. Finally, using the punch and hammer, tap the pins to ensure proper anchoring.
Reposition the wheel, secure the lug nuts with the pneumatic wrench, and after lowering the vehicle, check their tightness with a torque wrench.
Remember to pump the brake pedal until it provides the right resistance to reposition the brake caliper piston, and be sure to pay attention during the first braking as a break-in period will be necessary before achieving maximum efficiency from the newly serviced braking system.