ACDelco GM Original Equipment Brake Hydraulic Lines are quality reinforced lines that carry fluid within the brake system, and are GM-recommended replacements for your vehicle's original components. The hydraulic fluid must travel to the wheel brakes from the master cylinder. It does this through brake lines or pipes and brake hoses. Brake lines and hoses are designed to withstand high pressures, and these brake hydraulic lines have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.