Subaru Forester Rear Suspension Knuckle Bushing Failure
2014-2022 Subaru Foresters frequently experience premature failure of the rear knuckle bushings, leading to clunking noises and unstable high-speed handling.
Last updated: 2026-05-15
What goes wrong
The rubber bushings pressed into the rear wheel knuckles degrade and tear. This allows the rear wheels to shift out of alignment dynamically while driving. Left unaddressed, this causes the vehicle to feel unstable (wandering) at highway speeds and will rapidly destroy rear tires. In severe cases, the metal center sleeve of the bushing can separate completely from the rubber, leading to metal-on-metal contact.
Symptoms to watch for
- Loud clunking or 'banging' noise from the rear when driving over small bumps
- Visible tearing or leaking of the rubber bushing in the rear uprights
- A 'ghost-walking' or swaying sensation in the rear end on wet or icy roads
- Uneven rear tire wear (cupping or inner edge wear)
- Squeaking noises during low-speed suspension travel (entry/exit of driveways)
Root cause
The factory rubber bushings are soft-durometer and prone to premature tearing and dry-rotting due to environmental exposure and the high-travel nature of the Forester's suspension geometry, leading to excessive 'play' in the rear wheel alignment.
Buy time with these
- • Avoid driving over large potholes or debris.
- • Apply silicone-based lubricant to the bushing surface to temporarily reduce friction noise.
- • If the car feels unstable in the rain (fishtailing), reduce speed immediately and seek service.
Permanent fix
- Replacement of the OEM rubber bushings with upgraded high-density rubber or polyurethane bushings. Many specialists recommend aftermarket solutions like Whiteline or Mevotech, as Subaru often sells the entire knuckle assembly rather than the individual bushing.
Related recalls / TSBs
FAQ
What causes subaru forester rear suspension knuckle bushing failure?
The factory rubber bushings are soft-durometer and prone to premature tearing and dry-rotting due to environmental exposure and the high-travel nature of the Forester's suspension geometry, leading to excessive 'play' in the rear wheel alignment.
How much does it cost to fix?
National average $450–$1,200. Costs vary significantly based on whether a shop replaces just the bushing ($450-$600) using a specialized press-tool or replaces the entire knuckle assembly ($900-$1200). Parts for the assembly are roughly $350-$450 per side.
Is this a DIY repair?
Difficulty 4/5. Replacement of the OEM rubber bushings with upgraded high-density rubber or polyurethane bushings. Many specialists recommend aftermarket solutions like Whiteline or Mevotech, as Subaru often sells the entire knuckle assembly rather than the individual bushing.
What are the symptoms?
Loud clunking or 'banging' noise from the rear when driving over small bumps; Visible tearing or leaking of the rubber bushing in the rear uprights; A 'ghost-walking' or swaying sensation in the rear end on wet or icy roads; Uneven rear tire wear (cupping or inner edge wear); Squeaking noises during low-speed suspension travel (entry/exit of driveways)