1. Prepare tools and spare parts: Before replacing the brake drum, you need to prepare relevant tools and spare parts. You need to prepare spare parts such as wheel chocks, gloves, nut wrenches, brake calipers, brake bolt scissors, and new brake drums.

2. Preparation: Before replacing the brake drum, you need to drive the car so that it is on the ground and in a stable state. Prepare the wheel chocks and insert them into the remaining wheels to prevent the vehicle from starting. Then, you need to turn on the turn signal and cover the tire area related to the brake drum.

3. Disassembling the brake drum: Disassembling the brake drum may be difficult. Firstly, you need to press the nut that secures the brake drum on the axle. Then, you need to use bolt cutters to remove the brake bolts on the brake drum.

4. Replacing the brake drum: The operation of replacing the brake drum is the opposite of disassembling the brake drum. You need to insert the new brake drum on the axle and secure the brake bolts. Then, you can use a caliper to measure whether the distance between the brake drums is suitable, and pay attention to the fit between the bottom snap ring of the brake cylinder and the brake drum to determine whether it can be cleaned or replaced. Finally, you need to repeatedly hold the brake pedal and check whether the brake shoes move with the brake drum to ensure that the brakes are fully installed.