Replace the contaminated brake fluid in your 2003-2004 Dodge 5.9L Cummins before it starts to affect your braking performance. Despite being a closed system, brake fluid will eventually begin to collect moisture. As a result, the braking performance will begin to suffer due to the decreased boiling point caused by the water. Although brake fluid is sometimes one of the most overlooked fluids, brakes are one of the most crucial safety features of a vehicle. It is very important to follow the manufacturer's recommended service schedule for replacing the brake fluid. Manufacturers often recommend replacing the brake fluid every 2 to 3 years or at specific mileage intervals. Brake fluids are available in DOT 3, DOT 4, DOT 5, and DOT 5.1. DOT 3 and DOT 4 are the most commonly used brake fluids. DOT 3 is compatible with DOT 4 brake fluid however DOT 4 offers a higher boiling point. Shop XDP for all the leading producers of brake fluid including Lucas Oil, and more!