Parts for your 2020 Mazda 3-Ball joints

2020 Mazda 3 Ball-Joints — What They Do and When to Replace

Technical sources confirm ball-joints are fitted to the 2020 Mazda 3 (BP). The Mazda BP Workshop Manual describes a MacPherson strut front suspension with the steering knuckle linked to the lower control arm via a ball joint, while the Mazda Electronic Parts Catalogue lists the lower control arm assembly with an integrated front lower ball joint. Mainstream service databases used by workshops (e.g., Autodata/ALLDATA) also show a front lower ball joint on BP-series Mazda 3 models. The rear uses a torsion-beam axle, so there are no rear suspension ball-joints.

On the 2020 Mazda 3, those front lower ball-joints act like a tough little swivel that lets the front wheels steer and move up and down over bumps without binding. They keep the hub located accurately, help maintain proper wheel alignment angles, and contribute to that planted, confidence-inspiring feel the Mazda 3 is known for. They’re sealed for life and don’t need routine greasing, but they do rely on their rubber dust boots staying intact to keep out water and grit.

There’s no scheduled replacement interval, so servicing is all about inspection. A good workshop will check for torn boots, play in the joint, corrosion, or dried-out grease at every service. If there’s clunking over potholes, vague steering, shimmy under braking, or uneven front tyre wear, the ball-joints and control arm bushes are prime suspects. On many BP models the genuine fix involves replacing the entire lower control arm (which comes with the ball-joint pre-fitted). Some aftermarket suppliers offer the joint separately, but most workshops prefer the complete arm for durability and time savings.

• Typical symptoms of wear:
  • Clunks or knocks over bumps and speed humps
  • Steering wander or a loose, notchy feel
  • Feathered or uneven front tyre wear
  • Squeaks when turning or going over driveways

• Service tips for a tidy job:
  • Always replace damaged dust boots promptly
  • Tighten fasteners at normal ride height to protect control arm bushes
  • Torque all hardware to factory spec and fit new pinch bolts/nuts where specified
  • Book a wheel alignment immediately after any ball-joint/control arm work
  • Consider replacing both sides together for even handling and tyre wear

Because the rear is a torsion beam, there are no rear ball-joints to service, checks back there focus on bushes and the beam’s condition. Up front, timely attention to ball-joints keeps steering sharp, tyres happy, and kilometres carefree.

Popular questions

Does the 2020 Mazda 3 have rear ball-joints?
The BP-series Mazda 3 uses a torsion-beam rear axle, so there aren’t any rear suspension ball-joints. Rear-end servicing is mainly about inspecting bushes, dampers, and the beam itself.

How long do Mazda 3 ball-joints usually last?
With normal road use, many last well past 100,000 km and often much longer. Rough roads, torn dust boots, or frequent kerb hits shorten their life. Regular inspections help catch wear before it affects tyres or steering.

Do they replace just the ball-joint or the whole control arm?
Genuine parts are commonly supplied as a complete lower control arm with the ball-joint already installed. Some aftermarket options offer separate ball-joints, but many workshops choose the full arm for reliability and a quicker, cleaner install.