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BMW Control Arm - Febi Bilstein 31122347952 525i, 530i, 545i, 550i

BMW Control Arm - Febi Bilstein 31122347952 525i, 530i, 545i, 550i

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Part Numbers

31122347952, 31126760182

Product Information

Referred to as a wishbone by BMW, ball joint faces up

If the front end of your BMW is making sounds and feels loose it is likely due to worn control arms and ball joints. We recommend regularly inspecting the front suspension for play in the inner bushings and play in the outer ball joints. Most commonly we see ball joint failure occur when the dust boot fails allowing water and dirt to get inside the joint. We always recommend replacing control arms in matched pairs.

Part of BMW's Value Line, also includes:
33176760343 - Hex Bolt with washer
33306787062 - Combination nut
33326760668 - Self-locking collar nut

Suspension Control Arm and Ball Joint Assembly

Control arms are crucial link in a vehicle's suspension connecting the suspension to a vehicle's subframe. These pieces are usually hinged to allow for suspension to travel and articulate as the vehicle rides over obstructions in the road and while the vehicle turns. Many vehicles such as those with independent suspensions have multiple links and feature several connection points and arms to offer better ride quality and comfort.

As bushings and joints in a control arm begin to wear you may notice a looseness feel in your suspension. And while many arms have replaceable and serviceable individual components, many still require the replacement of the entire arm. Below are signs of when a replacement control arm may be needed:

Suspension Control Arm and Ball Joint Assembly Failure Symptoms

  • Play in suspension joints where these arms meet the subframe and/or knuckle
  • Buckling noise emanating from the suspension
  • Uneven tire wear
  • Inability to properly align vehicle
  • Shutter or vibration coming from the steering wheel at highway speed
  • Wandering or pulling sensation from side to side felt on the steering wheel

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