Parts for your 2011 Subaru Impreza-Control arms

2011 Subaru Impreza control-arms: what they do and how to look after them

Control-arms are absolutely fitted to the 2011 Subaru Impreza. Technical sources including the Subaru Workshop Manual for the GE/GH/GR series (Chassis/Suspension section) specify a front MacPherson strut layout with a lower control-arm, and a rear double-wishbone arrangement using lateral links and a trailing arm (functionally control-arms). Subaru’s parts catalogue for the 2011 Impreza also lists complete front lower arm assemblies and associated bushes and ball joints for this model.

On this Impreza, the control-arms locate the wheels, set alignment angles, and let the suspension move smoothly while keeping the tyre contact patch stable. Up front, the lower arm ties the knuckle, strut and subframe together via a ball joint and bushes. At the rear, the multi-link arms (lateral links and trailing arm) control wheel position under cornering and braking. Healthy bushes and ball joints mean crisp steering, even tyre wear and predictable handling—exactly what Impreza owners expect on Aussie and Kiwi roads.

As part of routine servicing, it’s smart to check the control-arms every 20,000–30,000 kilometres or annually—whichever comes first. Look for cracked or oil-soaked rubber bushes, split ball joint boots, rust around arm pivots, and any bent metal from kerb strikes or potholes. Cars that tow, run lowered springs, or tackle rough rural roads will benefit from more frequent inspections.

• Common symptoms of worn control-arms or bushes:
  • Clunks over bumps or when braking/accelerating
  • Steering wander or tramlining, off-centre wheel feel
  • Uneven or rapid tyre wear, especially on the inner edge
  • Shimmy under braking or vibration through the wheel

When replacing, many workshops choose complete front lower arms to refresh bushes and the ball joint in one go, though individual bushes can be pressed in with the correct tooling. Rear arms are usually serviced as links with replaceable bushes, depending on condition. Replace components in axle pairs where practical, torque all pivot bolts at normal ride height to avoid preloading the bushes, and always carry out a four-wheel alignment afterwards. Using new self-locking nuts and any single‑use bolts as specified by Subaru helps keep everything secure. Worn control-arms or bushes can cause a failed WOF (NZ) or RWC (AU), so timely attention keeps the Impreza safe, sharp and compliant.

• How long do control-arm bushes and ball joints last on a 2011 Subaru Impreza?

In typical Australian and New Zealand conditions, many owners see 80,000–150,000 km from factory bushes and ball joints. Lifespan varies with road quality, tyre choice, and driving style. Lowered setups or frequent gravel work can shorten service life.

Regular inspections during service intervals help catch small bush cracks or a weeping ball joint boot before they turn into clunks, tyre wear, or alignment issues.

• Can the bushes be replaced on their own, or is a full arm needed?

Both options are feasible. Front lower control-arm bushes and the ball joint can be replaced individually with the right press tools and alignment jigs. Many workshops prefer complete arms for a faster, cleaner repair and to renew all wear points at once.

Rear suspension links typically accept new bushes, but heavily corroded or bent arms are better replaced as assemblies.

• Is a wheel alignment required after control-arm work?

Yes. Any time control-arms, bushes, or ball joints are disturbed, alignment angles change. A four-wheel alignment restores correct camber, caster and toe, protecting tyres and keeping the Impreza’s steering feel nice and direct.

Ask the technician to torque pivot bolts at ride height before aligning, so the new bushes aren’t twisted at rest.