Toyota Mark II: JZX90 rear multi-link lower arm bush deterioration

The JZX90 uses a complex rear multi-link independent suspension system with multiple rubber pivot bushes per side. The lower lateral arm inner and outer bushes are prone to cracking and deformation after 25 or more years of service, causing toe and camber geometry to shift dynamically under cornering and braking loads. Rear handling becomes vague or unpredictable during cornering and motorway lane changes. The deterioration is gradual and owners frequently adapt to the degraded feel without realising how far the geometry has shifted from specification.

• Vague or wandering rear-end feel during cornering or motorway lane changes at speed
• Rear end steps out unexpectedly under moderate cornering loads
• Knocking or clunking from rear suspension over sharp bumps or road imperfections
• Uneven rear tyre wear on inner or outer edges indicating geometric drift

Attempt to move each arm in the plane of its pivot by hand to feel for bush play or slop. Check rear tyre wear pattern across the full tread width for evidence of toe or camber drift. A laser alignment print showing live rear geometry readings is highly informative. If a workshop inspection is possible: With the vehicle raised on a hoist inspect all rear multi-link arm bushes for cracking, splitting, or rubber extrusion beyond the bush housing.

Parts involved: Ball joint.

$600 to $1,800 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Have the rear suspension bushes been replaced, and if so when and with what brand?”
• “Has a four-wheel laser alignment been performed recently and were any adjustments required at the rear?”
• “Has any vagueness or looseness been noticed in the rear handling at motorway speeds?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.