Parts for your 2005 Toyota Bb-Control arms

2005 Toyota bB Control Arms — What They Do and When to Service Them

Control arms are absolutely used on the 2005 Toyota bB. Technical sources including Toyota service literature (TIS) for the NCP30/31 (first‑gen) and QNC20/21 (second‑gen, late 2005) platforms specify a front MacPherson strut suspension with a lower control arm (also called a lower arm or wishbone). Toyota’s parts catalogue lists a “Lower Arm Sub‑Assembly, Front Suspension” for both left and right sides on these chassis. Independent parts catalogues from recognised suppliers also carry front control arm bushes and ball joints for the 2005 bB, reinforcing that this component is fitted. The rear end is a torsion beam axle, so it doesn’t use traditional upper/lower control arms there.

On the 2005 bB, the front control arms locate the wheel hubs and manage the up‑down motion of the suspension while keeping alignment steady under braking and cornering. They pivot on rubber or polyurethane bushes at the subframe and connect to the steering knuckle via a ball joint. When everything’s tight, the little box cruises straight, steers predictably and wears tyres evenly.

Because these arms work hard, the bushes can crack or soften with age, and ball joints can develop play. That’s when the bB might wander on the motorway, clunk over bumps or start scrubbing tyres.

• Common signs it’s time: knocking over speed humps, steering that won’t sit straight, vibration under braking, uneven tyre wear, or WOF inspection notes for play in joints/bushes.
• Inspection tip: check bush condition and ball joint play at each service or every 20,000 km, especially on cars doing city kerb hops or rough rural roads.
• Replacement advice: quality arms or OE‑spec bushes/ball joints restore steering feel. Always tighten bush bolts at ride height to avoid preloading the bushes, and book a wheel alignment straight after.
• Australia/NZ note: fresh bushes and joints help pass WOF/roadworthy and keep tyre costs down.

Owners who prefer a firmer, more planted feel can consider polyurethane bush upgrades, while daily drivers usually stick with OE‑style rubber for comfort. If corrosion is present around the arm mounts or the ball joint boots are torn, don’t delay — a sorted front end makes a big difference to safety and confidence.

Popular questions about 2005 Toyota bB control arms

Do all 2005 Toyota bB models have control arms?
Yes — both early 2005 (NCP30/31) and late 2005 (QNC20/21) bB variants use a front lower control arm as part of the MacPherson strut setup. The rear uses a torsion beam, so no traditional control arms there.

Should the control arm be replaced or can I just do bushes and the ball joint?
It depends on condition. If the arm is straight and rust‑free, new bushes and a ball joint usually do the trick. If the arm is bent, cracked, or the ball joint is non‑serviceable, a complete arm is the smarter choice and often saves labour.

Will I need a wheel alignment after replacing control arms on my bB?
Absolutely. Changing arms, bushes, or ball joints affects camber and toe. An alignment brings the geometry back to spec, protects tyres and restores that tidy steering feel.