Protect your brake system to keep your vehicle running safely with STP Heavy Duty DOT 3 Brake Fluid. Formulated for all brake systems requiring DOT 3 fluid, this heavy duty brake fluid helps you get optimal performance out of disc and drum brake systems. This hydraulic fluid helps to provide protection against brake failure caused by vapor lock, and the hydraulic oil helps prevent corrosion in the brake system. Use this car fluid as needed, following the vehicle's manual for brake fluid flush instructions. One 32 fl oz can of STP 18668 Heavy Duty DOT 3 Brake Fluid.