Parts for your 2018 Holden Commodore-Control arms

2018 Holden Commodore control arms

Control arms are absolutely used on the 2018 Holden Commodore (ZB). Technical sources including the GM Holden ZB Commodore Service Information (Front and Rear Suspension – Description and Operation), Opel/GM engineering material for the E2XX platform (Insignia B), and Australian road tests from outlets like CarAdvice and WhichCar confirm a MacPherson-strut front end with lower control arms and a five‑link independent rear that uses multiple control arms/links. So, yes—control arms are relevant hardware on every ZB Commodore variant, from 2.0T front‑drive to V6 AWD.

On this model, the control arms link the wheel hubs to the body, keeping the tyres planted and the geometry where it should be through bumps, braking and cornering. The front lower control arms locate the hub fore‑aft and laterally, while the multi‑link rear uses several arms to finely manage camber and toe as the suspension moves. Bushes in the arms isolate vibration, and ball joints let the suspension pivot smoothly. It’s a quiet achiever’s job—but when an arm or bush wears, you’ll feel it.

Typical signs it’s time to check the Commodore’s control arms or bushes include:

• Clunks over sharp bumps, vague steering, or a shimmy under braking
• Uneven tyre wear (often inner edges), or the car wandering on the motorway
• Split ball joint boots, cracked or oil‑soaked bushes, or visible play on a pry‑bar test

Best practice for servicing is to inspect the arms, bushes and ball joints at each service or at least every 20,000 km—more often if the car sees rough roads, heavy loads or kerb strikes. On the ZB, rear multi‑link components and the front lower control arm rear bush are common wear points as kilometres add up.

When replacing, doing both sides on the same axle keeps handling consistent. Torque the arm bolts at normal ride height so the bushes aren’t preloaded, many fasteners are torque‑to‑yield and should be replaced rather than re‑used per Holden service guidelines. A wheel alignment is essential afterwards to set camber and toe correctly. Choosing quality OE‑equivalent arms (aluminium where fitted) and premium bushes will keep ride and steering feel crisp. AWD and FlexRide variants have extra rear links—make sure parts match your VIN. If pressing bushes, use the right jigs to avoid twisting the sleeves, otherwise, complete arm assemblies can be a smarter, quicker fit. A clean bill of health here pays off in straight tracking, quiet operation and even tyre life.

Popular questions about 2018 Holden Commodore control arms

How long do control arm bushes typically last on a ZB Commodore?
Many owners see 80,000–150,000 km from factory bushes, but it varies with road quality and driving style. Lots of potholes, speed humps or towing can shorten that window. Regular inspections catch early wear before it affects tyres and braking feel.

Do I need a wheel alignment after replacing control arms?
Yes. Any change to arms, bushes or ball joints can shift camber and toe. A post‑repair alignment brings the Commodore back to spec, protecting tyres and restoring steering precision.

Can I replace just the bush, or should I fit a whole arm?
Both options are valid. Press‑in bushes can be cost‑effective if you’ve got the tools. Complete arms save time, include a fresh ball joint (where applicable), and reduce the risk of pressing errors—often the better choice for driveway or time‑sensitive repairs.