Parts for your 2012 Subaru Impreza-Wheel hubs

2012 Subaru Impreza wheel hubs: what they do and when to replace them

Based on the Subaru Service Manual for the GJ/GP platform, Subaru Technical Information System (STIS), and the OEM parts catalogue for the 2012 Impreza, this vehicle absolutely uses wheel hubs. The front end employs a separate hub with a press-in, double-row ball bearing in the steering knuckle, while the rear end uses a bolt-on hub unit with the bearing and ABS encoder integrated. So yes—wheel hubs are very much part of a 2012 Subaru Impreza.

On a 2012 Impreza, the wheel hub’s job is to support the wheel and tyre, keep the bearing precisely aligned, and provide the mounting face for the rotor and wheel. At the rear, the hub unit also houses the ABS encoder that the wheel speed sensor reads. In short, the hub lets the wheel spin smoothly while handling cornering and braking loads, and it keeps the ABS and stability systems happy.

There’s no scheduled hub or bearing replacement interval, they’re sealed-for-life assemblies. That said, road grime, potholes, frequent river crossings, or big kerb hits can shorten their life. Good servicing practice on an Impreza is to check for bearing roughness or play at every major service. A quiet spin test, hand-on-spring feel test, and a rock at 12-and-6 o’clock with the wheel off the ground are simple checks. Any growling that rises with road speed, ABS warning lights, uneven tyre wear, or vague steering can be clues.

When replacement time comes, rear units unbolt from the knuckle and are pretty straightforward. Fronts are more involved: the bearing is pressed in and out of the knuckle and the hub is transferred, so a proper press and the correct drifts are a must to avoid damaging the new bearing. It’s smart to fit new circlips and seals, and to torque the axle nut to Subaru spec with the weight correctly supported. Quality matters here—genuine Subaru, NTN, NSK, or Koyo bearings and hubs are the go-to choices many Aussie and Kiwi workshops trust.

• Typical symptoms: humming or droning that changes in corners, ABS light, free play at the wheel, pulsation not cured by new rotors.
• Service tips: avoid impact-gunning axle nuts, don’t let the knuckle hang on the CV, and recheck torque after a short road test.
• After fitment: a wheel alignment check is worthwhile, especially if the knuckle has been disturbed.

Popular questions about 2012subaruimpreza wheelhubs

Does the 2012 Subaru Impreza have separate hubs and bearings, or a one-piece unit?

The front uses a separate hub and a press-in bearing in the knuckle. The rear is a bolt-on hub unit with the bearing and ABS encoder integrated. That layout is confirmed by the Subaru Service Manual and OEM parts listings for the GJ/GP Impreza.

What are the classic signs a 2012 Impreza hub or bearing is on the way out?

A speed-related hum or drone that gets louder when loading that corner, light vibration through the cabin, play at the wheel during a shake test, uneven tyre wear, or an ABS warning light (often rear) are the big giveaways. If the noise changes when turning gently left or right, that also helps pinpoint the side.

How much time and cost should be expected to replace them?

Rear bolt-on hub units typically take about 1–1.5 hours per side in a well-equipped workshop. Front press-in bearings usually run 2–3 hours per side because the knuckle needs to be pressed. Parts pricing varies by brand, but budgeting for quality OEM or name-brand components is wise to avoid doing the job twice.