BMW 3 Series: E46 Rear Trailing Arm Bushing Collapse

The E46 rear suspension uses trailing arms with rubber bushings at both the body mount and the wheel carrier end. These bushings compress and split with age, causing rear axle geometry to shift under load. Symptoms include rear-end wander, toe change under braking, and tyre wear on the inside rear edge. The body-side trailing arm bush in particular is a hydraulic rubber unit that deflates and collapses. Replacement is straightforward but requires pressing out old bushes. Many E46s in NZ/AU will be past the age where these have never been replaced.

• Rear-end wander or vagueness at highway speed
• Car pulling to one side under braking
• Uneven or accelerated rear tyre wear (inner edge)
• Rear suspension clunk over bumps or during acceleration

1. 1

   Inspect trailing arm bushings visually for cracking, splitting, or oil weeping from hydraulic units.

2. 2

   Check rear tyre wear pattern — inner edge wear is a key indicator.

3. 3

   If a workshop inspection is possible: Lift the rear of the car and grab each rear wheel at the 9 and 3 o'clock position — check for lateral play.

$600 to $1,600 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.

• “Has the rear suspension had any bushing or trailing arm work done?”
• “Are the rear tyres wearing evenly across the tread?”
• “Does the car pull or wander under braking?”

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.