Parts for your 2012 Toyota Bb-Struts

2012 Toyota bB struts – what they do and when to replace them

Yes, struts are relevant on the 2012 Toyota bB. The second‑generation bB (QNC20/QNC21) runs a MacPherson strut front suspension with a torsion‑beam rear that uses separate shock absorbers. This layout is documented in Toyota’s New Car Features (NCF) and Electronic Parts Catalogue (EPC) for QNC2# models, and mirrored by major fitment catalogues from brands like KYB and Monroe that list complete front strut assemblies for the bB. So, on this model, “struts” refers specifically to the front suspension units.

Up front, each strut combines the shock absorber, coil spring, and a structural housing that bolts to the steering knuckle. That design saves space, keeps weight down, and gives the bB its tidy steering feel around town. The strut supports the vehicle’s weight, damps bumps and body roll, and keeps the tyre’s contact patch stable so braking and cornering stay predictable.

Because struts cop a constant workout on Aussie and Kiwi roads, they’re wear items. There’s no hard‑and‑fast replacement interval, but many owners start seeing fatigue between 80,000 and 150,000 kilometres depending on load, road quality, and driving style. At service time, a quick visual and road test is the go.

• Watch for oil misting or wetness on the strut body
• Listen for knocks or creaks from the top mount/bearing
• Note extra bounce, nose‑diving, or a floaty feel
• Look for uneven or cupped tyre wear
• Steering that tramlines or feels vague over bumps

When it’s time to replace, it pays to do struts in pairs left/right to keep the bB balanced. A proper wheel alignment afterwards is essential. Good practice is to renew the top mounts/bearings, dust boots, and bump stops at the same time, if the springs are sagged or chipped, replace those too. The job needs a spring compressor and correct torque procedure, so most owners will have a workshop handle it.

Between replacements, sensible maintenance goes a long way. Keep tyres correctly inflated and rotated, and don’t ignore alignment pulls or vibrations. If the car carries heavy loads or sees rough rural roads, ask the technician to check the front struts every service and the rear shocks while it’s on the hoist. Fresh, healthy struts keep the bB riding comfortably, shorten braking distances, and protect those tyres from premature wear.

Popular questions about 2012 Toyota bB struts

Does the 2012 Toyota bB have rear struts?
No. The rear of the 2012 bB uses a torsion‑beam setup with separate shock absorbers, not struts. Only the front suspension is MacPherson strut type.

How often should bB front struts be replaced?
There’s no fixed schedule. Have them inspected at every service and consider replacement when leaking, noisy, or when ride and handling degrade. Many see replacement somewhere around 80,000–150,000 km, depending on conditions.

Is it OK to replace just one strut?
It’s strongly recommended to replace struts in pairs on the same axle. Mixing an old and a new unit can cause uneven handling, braking instability, and uneven tyre wear. Always finish with a wheel alignment.