Hard lines in automotive systems refer to rigid, non-flexible tubes or pipes used to carry fluids, such as brake fluid, fuel, oil, coolant, and even air, throughout a vehicle. They are typically made from materials like steel, aluminum, or copper, offering durability, strength, and resistance to corrosion. Hard lines are commonly used in critical applications where flexibility is less important, and the rigidity of the line helps prevent kinks, pressure loss, or leaks.
