Parts for your 1998 Subaru Forester-Wheel hubs

1998 Subaru Forester Wheel Hubs: What They Do and When To Replace

Wheel hubs are absolutely fitted to the 1998 Subaru Forester (SF series, AWD). The Subaru Factory Service Manual for the 1998 Forester, the Subaru Technical Information System, and OEM parts catalogues list front and rear wheel hub components with press-fit bearings, wheel studs and ABS-related hardware for this model. Aftermarket repair guides (e.g., Haynes/Gregory’s covering Impreza/Forester of the era) also include full hub and wheel bearing removal/installation procedures—so there’s no doubt the hub is a standard, serviceable part on this vehicle.

On the 1998 Forester, the hub’s job is to provide a solid mounting face for the brake rotor and wheel, hold the wheel studs, and rotate on a sealed double-row bearing that’s pressed into the steering knuckle or rear housing. It keeps the wheel running true, supports vehicle weight, and—on ABS-equipped models—works with the sensor/tone ring to feed accurate wheel speed data. Being AWD, the Forester relies on smooth, tight hubs to keep vibrations down and traction systems working properly.

These hubs use sealed bearings, so there’s no routine greasing. Good maintenance is mostly about prevention and checks during servicing:

• Keep wheel nuts torqued correctly—over-tightening can brinell the bearing.
• Avoid hard kerb hits and deep water crossings where possible.
• At each service, spin and feel for roughness, check for play at 12 and 6 o’clock, and look for uneven tyre wear.
• Inspect ABS sensor wiring and cleanliness around the sensor at the knuckle.

If a hub or bearing is on the way out, it’ll usually tell you with a humming or growling noise that gets louder with speed, a change in tone when cornering, vague steering, ABS light flickers, or warmth at the hub after a drive. Don’t leave it too long—run a failed bearing and it can chew out the hub and knuckle.

Replacement on this model typically involves pressing the old bearing out of the knuckle and pressing in a quality replacement (Koyo/NSK are common OE suppliers), then refitting the hub. Many techs replace the circlip, seals and axle nut as a matter of course. It’s a workshop-level job needing a press or a purpose-built hub tool, and care around the ABS sensor. After any knuckle-off work, a wheel alignment check is a smart move.

There’s no fixed interval, plenty of Foresters go well past 150,000 km before needing hubs/bearings, but rough roads and water can shorten that. When in doubt, replace the noisy side first, doing both sides isn’t mandatory unless wear is evident.

What are the common signs of a bad wheel hub or bearing on a 1998 Forester?

Classic symptoms include a steady humming or growl that increases with speed, slight changes in noise when loading one side through a bend, vague steering or a shimmy, ABS warning light activity, and heat at the wheel centre after a drive. Jack it up and check for play at the wheel, any clunk or roughness suggests attention is due.

Do the 1998 Forester’s wheel hubs need regular greasing?

No. The bearings are sealed units, so there’s nothing to grease. Maintenance is about correct wheel nut torque, careful driving, and periodic inspection. Replace the bearing (and any damaged hub or studs) if noise, roughness or play shows up.

Can a handy DIYer replace a Forester hub/bearing at home?

It’s doable with the right kit—a press or hub/bearing service tool, torque wrench, and usual spanners. Many owners still prefer a workshop, as pressing bearings in and out without damage, and handling the ABS sensor, can be fiddly. Always use new seals and the correct axle nut torque from the workshop manual.