Hard brake lines are more resilient than rubber but can develop hairline cracks after many heat cycles, stresses from service and age. The cracks will cause a loss in pressure, can corrode surrounding parts and can be a safety risk. We recommend inspecting all of your brake lines and hoses the next time you change your brake pads. Genuine Porsche part sourced in Germany to ensure quality, reliability and precise fitment. Sold individually. Driver's side fitment (lhd). 1 necessary per car.