RK Sport stainless steel braided brake lines are bolt-in replacements for soft rubber OEM brake lines that expand under pressure. This is commonly referred to as "line swell". A good deal of hydraulic energy is lost as the rubber lines swell decreasing total braking power, slowing brake response, and causing the pedal to feel "mushy". RK Sport Stainless Steel Braided Brake Lines are designed to transfer brake fluid the brake calipers or drums without losing any hydraulic energy in between. The result is a responsive, firm pedal feel and new found confidence in your braking system. RK Sport brake lines are engineered specifically for your application. All kits are a complete set of 4 lines and include necessary mounting hardware and detailed installation instructions.