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Parts for your 2020 Holden Commodore-Control arms
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2020 Holden Commodore control-arms — fitment, purpose and service tips
Control-arms are absolutely used on the 2020 Holden Commodore (ZB). GM’s Service Information for the ZB/Insignia B platform specifies a MacPherson strut front end with an aluminium lower control arm, and a multi-link independent rear with multiple control links (control-arms). The GM/Holden Electronic Parts Catalogue for 2018–2020 ZB Commodore also lists front lower control-arm assemblies and rear control links for applicable VINs. Those factory sources confirm the part is relevant and serviceable on this model.
On the road, the control-arms do the heavy lifting of keeping the wheels located while allowing smooth up-and-down movement. The arm’s bushings cushion vibration and road shock, while the ball joint lets the steering and suspension pivot cleanly. Together, they protect ride comfort, maintain alignment angles (camber and toe), and keep the Commodore tracking straight and braking confidently.
- Front: MacPherson strut with a lower control-arm and integrated ball joint.
- Rear: Five-link arrangement using multiple lateral control links and a trailing arm to fine-tune wheel control.
Because the arms cop constant load, the rubber (or hydraulic) bushes and ball joints wear over time. Common signs that the control-arms or their bushes need attention include:
- Clunks, knocks or creaks over bumps or when turning slowly.
- Uneven or rapid inner-edge tyre wear, steering wander, or tramlining.
- Vibration under braking or a vague on-centre steering feel.
For servicing a 2020 Commodore, a quick visual and pry-bar check of control-arm bushes and ball joints every service interval (typically 15,000 km) is smart. If play, tearing, cracked bushes, leaking hydrobush fluid, or split ball-joint boots are found, plan a replacement. A few handy tips:
- Replace arms or bushes in axle pairs where practical to keep handling balanced.
- Torque all fasteners at normal ride height, many bolts are torque-to-yield, so replace single-use hardware as per GM SI.
- Book a four-wheel alignment straight after any arm or bush change—multi-link rears are sensitive to small changes.
- If the car tows, runs bigger wheels, or sees rough roads, shorten inspection intervals and consider upgraded bushes.
- Any ABS/ESC or lane-keep alerts after suspension work usually clear once alignment is spot on and angle sensors are recalibrated if required.
Look after the control-arms and the ZB will reward with quieter, tighter steering and better tyre life—no dramas.
FAQs
Does the 2020 Holden Commodore have front and rear control-arms?
Yes. The front uses a MacPherson strut with a lower control-arm and ball joint, and the rear is a multi-link setup with several control links (control-arms) managing wheel alignment and stability.
How often should control-arm bushes be replaced on a ZB Commodore?
There’s no fixed kilometre rule. Inspect every service, many last well beyond 100,000 km, but harsh roads, heavy loads or age can crack bushes sooner. Replace when there’s play, noise, fluid leak from hydrobushes, or uneven tyre wear.
Do I need a wheel alignment after replacing a control-arm?
Definitely. Any time a control-arm, bush or ball joint is changed, a professional four-wheel alignment is recommended to restore camber, caster and toe so it drives straight and protects your tyres.
