The grinding noise coming from your front wheels isn't a mystery. It's probably a cracked or broken vinyl vacuum line. Ford's IWE system uses vacuum to disengage your front hubs in 2WD. The system runs a combination of rubber and vinyl lines — and it's the vinyl runs and plastic connectors that crack, harden, and fail over time. When vacuum bleeds out through a cracked line or split fitting, the hubs partially engage and you get that grinding, ratcheting sound that makes every F-150 owner think their front end is falling apart. It isn't. The vinyl lines and plastic tee just need to be replaced. But replacing them with OEM vinyl means replacing them again in a few years when those crack too. Before you order — verify the lines are the problem: Check vacuum integrity at the IWE actuator and check valve. If vacuum holds at those components, the lines and tee are your culprit. This kit fixes that permanently. If the actuator or check valve itself has failed, those components need to be addressed separately — this kit won't fix a mechanically failed IWE unit. Diagnose first. Buy with confidence. This kit fixes it permanently. The Infinity Overland IWE Silicone Vacuum Line Kit is the only full silicone replacement kit on the market built specifically for Ford's vacuum IWE hub system. Not generic silicone hose cut to length — a custom dual-lumen extrusion purpose-built to the correct bore diameter, wall thickness, and lumen spacing for this exact application. Paired with a solid brass tee connector that replaces the factory plastic fitting that splits and fails. What's in the kit: Custom VMQ silicone dual-lumen vacuum lines — rated to 392°F continuous Solid brass tee connector — replaces factory plastic split fitting OEM-style retention clips — routes and mounts exactly like factory Complete hardware — everything needed, nothing extra required Vehicle Fitment — vacuum-operated IWE hub system only: Ford F-150 2003–2020 (4WD models) Ford SVT Raptor 2010–2020 (Gen1 & Gen2 — Gen3 2021+ uses electronic hubs, does not apply) Ford Expedition 2003–2015 (4WD models) Lincoln Navigator 2003–2015 (4WD models) Verify your vehicle is equipped with vacuum-operated IWE hubs before ordering. Why silicone and not OEM vinyl: VMQ silicone handles –58°F to +482°F. It doesn't harden, crack, or collapse under heat cycling. The IWE system sits directly above the exhaust manifold — temperature matters more here than almost anywhere else under the hood. OEM vinyl lines are a ticking clock. Silicone isn't. Why custom extrusion and not generic silicone hose: Generic silicone hose is cut from bulk stock in whatever diameter is close enough. Our dual-lumen extrusion was custom-tooled to the exact specifications of Ford's IWE routing — correct bore diameter, correct wall thickness, correct lumen spacing. It's not a workaround. It's a replacement. Why brass and not plastic: The factory plastic tee fitting is one of the most common failure points in the entire system. It splits, cracks, and loses vacuum just like the vinyl lines. Solid machined brass doesn't. The brass tee in this kit is the last tee fitting you'll ever put in that location. Assembled in Nevada. Built strong. Built to last.