Parts for your 2017 Subaru Legacy-Wheel hubs

2017 Subaru Legacy wheel hubs — what they do and how to look after them

Based on the Subaru Factory Service Manual (Subaru Technical Information System) for the 2015–2019 Legacy/Outback platform and the Subaru Genuine Parts Catalogue for MY2017 BN-series Legacy (Liberty in Australia), the vehicle is fitted with bolt-in hub unit bearings at all four corners. So wheel hubs are absolutely relevant to the 2017 Subaru Legacy, forming the mounting point for the wheels and the sealed bearing assembly that lets them spin smoothly while supporting vehicle loads and feeding ABS/traction data.

On a 2017 Subaru Legacy, each wheel hub assembly combines a precision bearing with the hub flange that the wheel bolts onto. The unit keeps the wheel tracking straight, carries cornering and braking loads, and works with the ABS/Vehicle Dynamics Control system via an encoder and nearby wheel speed sensor. Being a sealed unit, it’s maintenance-free internally, but it still benefits from regular checks during routine servicing.

For everyday care, a workshop should inspect for play, roughness, and any ABS wiring damage at each service or tyre rotation. Hubs can last well beyond 100,000 kilometres, but harsh roads, potholes, kerb strikes, or water ingress can shorten their life. When replacement is needed, the Legacy uses a bolt-on assembly, so the job is straightforward for a competent technician with the right tools, though proper torque procedures are critical to avoid premature bearing wear.

• Common signs of a tired hub: a humming or growling that changes with speed or steering load, ABS/traction lights, uneven tyre wear, or a faint grind you can feel through the steering or body.
• Inspection tip: with the vehicle safely lifted, check for play at the 12-and-6 o’clock positions and spin the wheel while listening for roughness.

When fitting new hubs, quality matters. Choose reputable OEM-equivalent parts, renew single-use fasteners and axle nuts if specified by the factory, and clean the knuckle face so the new hub sits perfectly flush. It’s also smart to inspect the dust shield and wheel speed sensor, and to torque wheel nuts evenly to the manufacturer’s spec to avoid introducing lateral load into the bearing. If a hub is noisy on one side, there’s no strict rule to replace in pairs, however, if both sides show similar wear or the vehicle has high kilometres, doing them together can save labour and keep handling feel consistent.

• Everyday habits that help hubs: avoid pressure-washing directly at seals, don’t over-tighten wheel nuts, and steer clear of kerbing tyres when parking.
• If in doubt, have a professional road-test and confirm the noise source before replacing parts—tyres and pads can mimic hub noises.

Popular questions about 2017 Subaru Legacy wheel hubs

What are the symptoms of a bad wheel hub on a 2017 Subaru Legacy?

A failing hub commonly makes a steady humming or growling that gets louder with speed and may change when gently weaving the car left and right. You might also feel faint vibration through the seat or steering, notice uneven tyre wear, or see the ABS/VDC warning if the encoder signal is affected.

On a hoist, play at the wheel when rocked at 12-and-6 o’clock, a rough feel when spinning the wheel by hand, or visible damage to the dust shield or ABS sensor wiring backs up the diagnosis. Always rule out cupped tyres and noisy brake pads before condemning the hub.

How long do the wheel hubs last, and should they be replaced in pairs?

In normal Aussie and Kiwi conditions, hubs often run well past 100,000 km, but big potholes, frequent gravel roads, or salt exposure can shorten their life. Regular inspections during services and rotations help catch wear early.

There’s no absolute need to replace in pairs. If only one side is noisy and the other checks out, one hub is fine. If the vehicle has high kilometres or both sides show similar wear, replacing both fronts or both rears can be cost-effective and keep steering and braking feel even.

Is it safe to drive with a noisy wheel hub?

Short trips may be possible, but it’s not ideal. A deteriorating hub can worsen quickly, affect braking performance, and trigger ABS/traction faults. In extreme cases it can overheat or seize.

Book it in promptly for diagnosis. If the noise grows rapidly, there’s play you can feel, or an ABS light appears, limit driving and have the car transported to a workshop to avoid collateral damage to the knuckle, sensor, or brake components.