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I have a Mazda CX-9/280k which needed passenger lower control arm ball joint replaced. The job went fine, however after completion, I was packing up the tools and had the dreaded moment when you find there is something I had forgotten on the cart.

In this case it was a little stainless steel washer (?) which goes between the hub and the ball-joint:

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What is the purpose of this part? Do I need to revisit the job, to reinsert it? Currently the install looks like:

enter image description here

Update: Below is the other size. It just slides over the top of the ball-joint:

enter image description here

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  • Where exactly does this part fit? Can you show us a pic of where it's installed on the other side of the vehicle?
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Mar 24, 2019 at 17:15
  • Added the pick, just seems to clip over the hub
    – Chris
    Mar 25, 2019 at 12:44
  • What year is it? Looks like a scuff shield for the ball joint rubber.
    – Moab
    Mar 26, 2019 at 21:03
  • Year is 2008... scuff shield, that could make sense. I guess i could accomplish the same if i keep it lubed with silicon grease
    – Chris
    Mar 27, 2019 at 1:07
  • Agree with this, probably to prevent the boot from sticking and twisting during sharp turns, probably increases the service life of the boot.
    – masospaghetti
    Aug 12, 2022 at 17:02

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Yes.. It looks like its made from stainless steel so I also would think its to prevent the ball joint boot from sticking to the hub assy and possibly wearing/tearing it.

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