Parts for your 2007 Toyota Bb-Coil springs

2007 Toyota bB coil springs — what they do and when to replace them

Yes, the 2007 Toyota bB uses coil springs front and rear. Technical sources that document this include Toyota’s New Car Features and repair manual set for the QNC20/QNC21/QNC25 series (front MacPherson strut with coil springs, rear torsion-beam axle with coil springs), the Toyota Electronic Parts Catalogue that lists separate front and rear coil spring part numbers for the bB, and sister-vehicle manuals for the Daihatsu Materia and Subaru Dex that share the same platform and suspension layout.

On the 2007 bB, the coil springs carry the vehicle’s weight, set ride height, and let the shocks/struts control motion over bumps. When they’re healthy, the car sits level, rides comfortably and tracks true. Over time—especially with Aussie and Kiwi roads, loads, and plenty of kilometres—springs can sag, crack, or rust. That’s when ride height drops, the ride gets crashy, and tyre wear or clunks can creep in.

There’s no fixed replacement interval for coil springs, but they should be inspected at each service. A good workshop will check for uneven ride height, broken coils (often near the ends), flaking rust, damaged paint, or perished rubber seats/insulators. On strut fronts, they’ll also look at top mounts and bearings, at the rear beam, they’ll check spring seats and associated bushes. If one spring’s shot, replace them in axle pairs to keep the bB sitting and handling evenly.

If replacement’s needed, it’s worth choosing quality springs matched to how the bB is used—standard height for daily duties, or an approved lowered option if that’s the brief. Pairing new springs with fresh shocks/struts is smart if the dampers are tired, it saves labour and restores the whole suspension’s feel in one hit.

Safety note: coil springs store serious energy. Proper spring compressors and correct procedures are a must. A pro will mark orientation, transfer isolators, torque fasteners at normal ride height, and finish with a wheel alignment to protect tyres and keep the steering sweet. For owners, keep an ear out for knocks, watch for uneven tyre wear, and don’t ignore any rear-end sag when there’s a bit of gear in the boot—those are early hints the bB’s springs need attention to stay safe and comfy for the school run or the state-highway slog.

• Inspect springs every service (especially before a WOF/roadworthy).
• Replace in axle pairs, check shocks, mounts, and insulators at the same time.
• Get a wheel alignment after any spring or strut work.

Popular questions

Does the 2007 Toyota bB have coil springs at both ends?
Yes. The QNC20-series bB uses coil springs with MacPherson struts up front and coil springs on a rear torsion-beam axle. That setup delivers compact packaging, predictable handling, and easy servicing.

How can someone tell if their bB’s coil springs are worn?
Common signs include a sagging stance, uneven ride height side-to-side, clunks over bumps, or a harsh ride. Visual checks may show chipped paint, rust, or a broken coil at the end of the spring. If in doubt, have a technician measure ride height and inspect the seats and mounts.

Should coil springs be replaced with shocks/struts together?
Not always, but it’s often recommended. If the springs are being changed and the shocks/struts are old or weeping, doing them together restores ride and saves on duplicate labour. It also helps the bB track straight and brake more confidently.