Ford F-150 IWE Check Valve FL3Z-3A788-B | 4WD Hub Lock Vacuum Line 2015–2020 + Install Video

Ford F-150 IWE Check Valve — FL3Z-3A788-B | 4WD Hub Lock Vacuum Line 2015–2020

Fix that annoying grinding noise from your F-150's front wheels with this Genuine Ford OEM IWE (Integrated Wheel End) Check Valve. This small but critical vacuum line component is one of the most common causes of grinding or growing noises in 4WD Ford trucks — and replacing it is a quick, easy fix.

🎥 FREE Step-by-Step Installation Video Included
Every order includes access to our exclusive install video guide, so you can replace your IWE check valve quickly and confidently without a mechanic.

Key Features
- Genuine Ford OEM Part No: FL3Z-3A788-B
- Replaces previous version: FL3Z-3A788-A
- Fixes grinding/growling noise from front wheels in 4WD models
- Restores proper IWE hub lock vacuum function
- Direct-fit OEM replacement — plug and play
- Free installation video guide included

Symptoms of a Failing IWE Check Valve
- Grinding or growing noise from front wheels when driving
- Noise disappears when engaging 4WD
- Noise present in 2WD mode only
- Front hub not disengaging properly

Vehicle Compatibility (4WD models only)
- 2015–2020 Ford F-150 (4WD — All Trims including Raptor)
- 2018–2020 Ford Expedition (4WD)
- 2018–2020 Lincoln Navigator (4WD)

Please note: This part is for 4WD equipped vehicles only.

What's Included
- 1 x Ford OEM IWE Check Valve (FL3Z-3A788-B)
- 🎥 Access to installation video guide

Why Choose SayParts?
We include a free install video with every order so you can get the job done right the first time. Genuine OEM parts, fast US shipping, and real support when you need it.

✅ Genuine Ford OEM | 📦 Fast US Shipping | 🎥 Free Install Video | 💰 Best Price Guaranteed