Brown leaves on succulent plants can be a sign of a variety of issues. Here's a detailed guide on why your succulent might have brown leaves and how to solve it:

1. Overwatering: Overwatering is one of the most common reasons why succulent leaves turn brown. If the soil is too wet, the roots can become waterlogged and start to rot, which can cause the leaves to turn brown and mushy. To solve this issue, allow the soil to dry out completely before watering again, and make sure the pot has good drainage.

2. Underwatering: Succulent leaves can also turn brown if the plant is not getting enough water. If the soil is too dry, the leaves can start to dry out and turn brown. To solve this issue, water the plant thoroughly, making sure to saturate the soil.

3. Lack of sunlight: Succulent plants require plenty of sunlight to thrive. If your plant is not getting enough sunlight, the leaves can start to turn brown and become weak. To solve this issue, move your plant to a sunnier location, or provide artificial light if necessary.

4. Pest infestation: Pests such as spider mites and mealybugs can cause brown spots on succulent leaves. To solve this issue, inspect the plant regularly for signs of pests and treat them with an insecticidal soap.

5. Root rot: Root rot is a fungal disease that can cause the roots of the succulent to rot, which can lead to brown leaves. To solve this issue, remove the plant from the soil, trim off any affected roots, and replant in fresh soil mix with good drainage.

6. Nutrient deficiency: A lack of essential nutrients can cause the leaves of succulent plants to turn brown. To solve this issue, fertilize the plant with a balanced fertilizer designed for succulent plants.

In summary, brown leaves on succulent plants can be caused by a variety of issues, including overwatering, underwatering, lack of sunlight, pest infestations, root rot, and nutrient deficiencies. Identifying the underlying cause and addressing it promptly can help your succulent plant recover and thrive.