GM Genuine Parts Brake Hydraulic Lines are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These are quality reinforced lines that carry fluid within the brake system.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. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).