Wheel Bearing for a 2004 Ford Explorer
What is a Wheel Bearing?
A wheel bearing is a crucial component that allows the wheel to spin smoothly with minimal friction. It consists of steel balls or rollers housed inside a metal ring and is located inside the wheel hub assembly. The 2004 Ford Explorer uses sealed wheel bearings, meaning they are not serviceable and must be replaced if they fail.
Where is the Wheel Bearing Located?
The wheel bearing is inside the wheel hub assembly, connecting the wheel to the axle. In a 2004 Ford Explorer, wheel bearings are present in both the front and rear wheels:
- Front Wheel Bearings – Integrated into the hub assembly, requiring full hub replacement.
- Rear Wheel Bearings – Pressed into the rear knuckle, requiring a press tool for removal.
Signs of a Failing Wheel Bearing
- Grinding or humming noise while driving, especially when turning.
- Vibration in the steering wheel or vehicle body.
- Uneven tire wear due to wheel wobbling.
- Wheel play or looseness when rocked side to side.
- ABS warning light (if the bearing includes a wheel speed sensor).
How to Replace a Wheel Bearing on a 2004 Ford Explorer
Tools Needed
- Jack and jack stands
- Lug wrench
- Socket set (including 32mm axle nut socket for 4WD models)
- Torque wrench
- Bearing press tool (for rear wheel bearings)
- Hammer and pry bar (for stuck hub assemblies)
Front Wheel Bearing Replacement (4WD & 2WD)
- Lift the vehicle and remove the wheel.
- Remove the brake caliper and rotor to access the hub.
- Disconnect the ABS sensor (if equipped).
- Remove the axle nut (4WD models only).
- Unbolt and remove the wheel hub assembly (may require prying or hammering).
- Install the new hub assembly, ensuring proper alignment.
- Reassemble components and torque bolts to factory specs.
Rear Wheel Bearing Replacement
- Lift the vehicle and remove the wheel.
- Remove the brake caliper and rotor.
- Disconnect the parking brake and ABS sensor (if equipped).
- Use a press tool to remove the old bearing from the knuckle.
- Press the new bearing into place.
- Reassemble components and torque to factory specs.
Cost of Replacing a Wheel Bearing
- Parts cost:
- Front wheel hub assembly: $100–$250 per wheel
- Rear wheel bearing: $50–$150 per bearing
- Labor cost:
- Front: $150–$300 per side
- Rear: $200–$400 per side (due to pressing)
Final Thoughts
The 2004 Ford Explorer’s wheel bearings are built into the hub assembly, requiring full replacement if they fail. The front bearings come as a complete hub assembly, while the rear bearings need to be pressed in. If you hear humming, grinding, or feel vibrations, it’s time to check and replace the bearings to prevent further damage.
FAQs
1. How long do wheel bearings last on a 2004 Ford Explorer?
Wheel bearings typically last 100,000–150,000 miles, but off-road driving or harsh conditions can shorten their lifespan.
2. Can I drive with a bad wheel bearing?
No, a failing wheel bearing can cause wheel detachment or brake failure if ignored.
3. Do I need an alignment after replacing a wheel bearing?
Not always, but if the rear bearings were replaced, an alignment is recommended.
4. Can I replace just one wheel bearing?
Yes, but if one fails, the other on the same axle may soon follow.
5. How do I know if my front or rear wheel bearing is bad?
- Front bearing noise changes when turning the steering wheel.
- Rear bearing noise stays the same regardless of steering direction.
