2018 Ford F150 Front Wheel Bearing – Replacement And Troubleshooting
A failing front hub assembly on your truck can lead to significant safety risks and expensive drivetrain repairs if ignored. This guide provides a comprehensive walkthrough for diagnosing, removing, and installing a new 2018 ford f150 front wheel bearing to restore your vehicle’s smooth ride and 4WD performance.
If you have noticed a persistent humming or grinding noise coming from the front of your truck, you are likely dealing with a worn hub assembly. It is a common issue for high-mileage pickups, especially those used for heavy towing or frequent off-roading in muddy conditions.
Replacing the 2018 ford f150 front wheel bearing is a manageable task for most DIY mechanics with the right tools and a bit of patience. This article will help you identify the symptoms of failure and guide you through a professional-grade installation process.
Our goal is to ensure your repair is done safely and correctly the first time. By understanding the nuances of the Ford vacuum-actuated 4WD system, you can avoid common pitfalls that lead to premature part failure.
Symptoms of a Failing 2018 ford f150 front wheel bearing
Identifying a bad bearing early can save you from being stranded on the side of the road or a trail. The most frequent indicator is a growling or droning noise that changes pitch as you increase or decrease your vehicle speed.
You might also feel a distinct vibration through the steering wheel or the floorboards. If the internal races of the bearing have significant wear, the wheel may even develop physical play, which compromises your steering geometry and tire wear.
The “Sway Test” Diagnosis
A classic way to confirm which side is failing is to safely oscillate the truck while driving at a moderate speed on an empty road. If you veer left and the noise gets louder, the right bearing is likely the culprit because it is under more load.
Conversely, if the noise disappears when you turn in a specific direction, you have effectively narrowed down the side that needs attention. Always perform this test with extreme caution and away from other traffic.
ABS and Traction Control Warnings
The hub assembly on your truck contains the wheel speed sensor. When the bearing begins to fail, it can cause the internal tone ring to wobble, leading to erratic sensor readings.
This often triggers the ABS or Traction Control light on your dashboard. If you see these lights accompanied by a grinding noise, it is a clear sign that the hub unit is no longer maintaining its structural integrity.
Understanding the IWE Vacuum System
Before you start pulling bolts, you must understand the Integrated Wheel End (IWE) system. This system uses vacuum pressure to disengage the front hubs when you are in 2WD mode to improve fuel economy.
When the engine is running and the truck is in 2WD, vacuum pulls the IWE actuator away from the hub. If there is a vacuum leak or the actuator is damaged, it can cause a partial engagement noise that sounds very similar to a bad bearing.
Testing the IWE vs. The Bearing
To differentiate between a bad bearing and a vacuum issue, switch your truck into 4H (4WD High) while driving. If the grinding noise immediately disappears, the problem is likely your IWE actuator or a vacuum leak rather than the bearing itself.
If the noise persists regardless of whether you are in 2WD or 4WD, then the 2018 ford f150 front wheel bearing is almost certainly the part that needs to be replaced. Distinguishing between these two is critical to avoid replacing healthy parts.
Tools and Parts Required for the Job
Having the right equipment on hand will turn a frustrating afternoon into a successful project. You will need a heavy-duty floor jack, high-quality jack stands, and a variety of metric sockets, specifically 8mm, 13mm, 18mm, and 21mm.
A torque wrench is non-negotiable for this job. Overtightening or undertightening the hub bolts or the CV axle nut can lead to catastrophic failure of the new part within a few hundred miles.
- Large breaker bar for stubborn suspension bolts.
- Vacuum pump (optional but helpful for testing IWE).
- High-temp anti-seize lubricant.
- New hub assembly with integrated ABS sensor.
- Replacement CV axle nut (Ford recommends a new one each time).
Make sure you purchase a high-quality replacement hub. Off-brand bearings may save money upfront, but they often lack the durability required for the weight and torque of a full-size Ford pickup.
Step-by-Step Removal Process
Start by loosening the lug nuts while the tire is still on the ground. Once the truck is securely supported on jack stands, remove the wheel and the dust cap covering the CV axle nut in the center of the hub.
Remove the brake caliper by undoing the two large bolts on the back of the knuckle. Do not let the caliper hang by the rubber brake hose; use a bungee cord or a “S” hook to hang it from the frame or coil spring.
Removing the Rotor and ABS Sensor
Slide the brake rotor off the studs. If it is stuck due to rust, a few gentle taps with a rubber mallet on the “hat” of the rotor should break it loose without damaging the braking surface.
Locate the ABS sensor wire and trace it back to the connector inside the wheel well. Carefully unplug it and remove the small 8mm bolt holding the sensor into the hub assembly to prevent snagging the wire during removal.
Unbolting the Hub Assembly
There are four 18mm bolts holding the hub to the steering knuckle. These are often coated in thread locker and road grime, so using a breaker bar or an impact wrench is highly recommended here.
Once the bolts are out, the hub might still be fused to the knuckle by corrosion. Use a large hammer to strike the old hub flange (since you aren’t reusing it) until it separates from the knuckle, being careful not to damage the IWE actuator behind it.
Installation and Reassembly
Before installing the new 2018 ford f150 front wheel bearing, take a moment to clean the mounting surface on the steering knuckle. Use a wire brush to remove any rust or scale that could prevent the new hub from sitting flush.
Apply a thin layer of anti-seize to the bore of the knuckle, but be careful not to get any on the gears of the IWE actuator. Proper alignment of the CV axle splines with the new hub is the most critical part of this step.
Seating the CV Axle Correctly
Slide the new hub over the CV axle. You must ensure the splines on the axle fully engage with the internal splines of the IWE actuator and the hub itself. Rotating the hub slightly while pushing inward usually helps them mesh.
Thread the four mounting bolts back in by hand to avoid cross-threading. Tighten them in a criss-cross pattern to ensure the hub is pulled in evenly against the knuckle face.
Critical Torque Specifications
The four main hub-to-knuckle bolts should be torqued to 129 lb-ft. The small CV axle nut only requires about 30 lb-ft. Over-torquing this small nut is a common mistake that can snap the end of the CV axle.
Once the hub is secure, reinstall the brake rotor and caliper. Ensure the caliper bracket bolts are torqued to 184 lb-ft, as these carry the immense load of stopping your truck from highway speeds.
Troubleshooting Common Post-Install Issues
If you hear a “clicking” noise after the install, the CV axle might not be fully seated in the IWE actuator. This often happens if the vacuum wasn’t released or the splines weren’t perfectly aligned during the “pull-in” phase.
Another common issue is a lit ABS light. Double-check that the sensor wire is plugged in securely and that the wire isn’t stretched or pinched by any suspension components when the wheels are turned lock-to-lock.
If you experience a vibration that wasn’t there before, check your lug nut torque. Always re-torque your wheels to 150 lb-ft after the first 50 miles of driving following any hub or brake work.
Frequently Asked Questions About the 2018 Ford F150 Front Wheel Bearing
How long does a front wheel bearing last on a 2018 F-150?
On average, these bearings last between 80,000 and 120,000 miles. However, if you frequently drive through deep water, mud, or use heavy offset wheels, the lifespan can be significantly shorter.
Can I replace just the bearing or do I need the whole hub?
For the 2018 model year, the bearing is a non-serviceable, sealed unit integrated into the hub. You must replace the entire hub assembly; you cannot press a new bearing into the old housing.
Do I need an alignment after replacing the hub?
Technically, replacing the hub does not change your alignment settings (toe, camber, or caster) because you aren’t adjusting the tie rods or control arms. However, it is always a good practice to check your alignment if you’ve noticed uneven tire wear.
Why is my new bearing making a grinding noise in 2WD?
This is usually caused by a vacuum leak in the IWE system. If the actuator doesn’t receive enough vacuum, it will partially engage the hub, creating a grinding sound. Check your vacuum lines and the check valve near the firewall.
Taking care of your 2018 ford f150 front wheel bearing is essential for maintaining the reliability of your truck. Whether you are hauling gear to a job site or heading out for a weekend of camping, a solid front end provides the confidence you need.
By following these steps and paying close attention to the IWE system, you can tackle this repair in your own driveway. Stay safe, double-check your torque specs, and enjoy the silence of a healthy drivetrain!
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