2017-2022 Super Duty SS Extended Brake Lines 4.5"/5.5" Lift (CS-FORDBBL-45-17)Ensure your braking system is as capable as your suspension with Carli's Extended Stainless Steel Brake Lines. When lifting your Super Duty, the factory rubber lines become the limiting factor, preventing full suspension droop and creating a dangerous weak point. Our DOT approved, Kevlar reinforced stainless lines provide the necessary length for a 4. 5 inch lift and offer a massive improvement in performance by eliminating the "spongy" pedal feel