DOT 5 is a type of brake fluid that is silicone-based, making it different from other brake fluids that are glycol-based. It is designed for use in high-performance vehicles and is known for its high boiling point, which helps prevent brake fade during intense driving conditions. Additionally, DOT 5 is non-hygroscopic, meaning it does not absorb moisture, which can help maintain its performance over time. However, DOT 5 is not compatible with other types of brake fluids, such as DOT 3 or DOT 4. Mixing different types can lead to brake system failure. Therefore, it is essential to ensure that the brake system is completely flushed before using DOT 5.