Working in the luggage compartment, remove the wheel arch trim and raise the car to take off the rear wheel. The shock absorber plays a crucial role in preventing the drive axle and wheel bearing carrier from dropping excessively; therefore, supporting the wheel bearing carrier before disconnecting the shock absorber mounting fasteners is essential to avoid damaging the brake hose, parking brake cable, and drive axle CV joints. Remove the upper shock absorber mount fastener along with the washer, then take out the lower mounting bolt. Compress and detach the shock absorber from the vehicle. If a replacement is needed, transfer the top mount, dust cover (if applicable), and related components to the new shock absorber. Counterhold the piston rod with a suitable wrench while handling the washer plate, bump stop, damper protective tube, and rear shock absorber. The installation process is the reverse of removal, ensuring that all threaded bolts, nuts, and mating surfaces are clean. Attach the shock absorber upper mount to the subframe using new self-locking nuts, and avoid mixing shock brands on a single axle by using the BMW part number to match manufacturers. Finally, tighten the fasteners to the final torque only after the vehicle has been lowered and the suspension has settled.