Maintain proper performance of the braking system in your 2004.5-2005 Chevy/GMC 6.6L LLY Duramax with new brake fluid. Brake fluid will start absorbing moisture from the air over time. Since water lowers the boiling point of brake fluid, this water contamination may cause your brakes to begin to lose efficacy. Manufacturers often advise changing the brake fluid every two to three years or after a certain number of miles. Following the manufacturer's suggested maintenance schedule is crucial, as is occasionally checking your brake fluid. There are several different types of brake fluids available, including DOT 3, DOT 4, DOT 5, and DOT 5.1. The DOT 3 and DOT 4 brake fluids are the most commonly used. DOT 4 has a greater boiling point than DOT 3, despite the fact that the two brake fluids are compatible. Although brake fluid is sometimes one of the most overlooked fluids, brakes are one of the most crucial safety features of a vehicle. XDP offers brake fluids from the top brands such as Lucas Oil, and more!