2015 GT Caliper conversion problem

Discussion in '2005+ Mustang GT 4.6L Tech' started by OvalSports, May 23, 2022.

  1. OvalSports

    OvalSports Junior Member

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    So we put on these huge 14” Boss rotors and Boss 19” rims using 2015 4-piston (non-Performance Pack S550) calipers, but the inside of the boss wheels seat against the calipers.

    Anyone run into this problem?
    Simple wheel spacer solution, or did we do something wrong?

    14D3CD60-F321-4CD7-87D6-CFE5E37C6323.jpeg
     
  2. bambam 06

    bambam 06 Member

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    A 1/8" aluminum spacer will probably resolve that issue.
     
  3. bl817

    bl817 Member

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    did you use the washer/spacer between the caliper and the wheel hub? there is a write up on all parts needed in the V6 section. the spacer should pull the caliper away from the rim enough to clear. the Boss rims clear 4 pot Brembo clalipers so i think you have a spacing issue. good luck
     
  4. OvalSports

    OvalSports Junior Member

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    Thanks for the reply. Yes, we spaced the caliper as imaged between the caliper bracket and the caliper, but it actually pushes the caliper out towards the rim. This is what counters the proper wheel offset, but it is required to center the rotor.

    F6B8E861-44C6-45C2-842E-86A7B20C10A5.jpeg
     
  5. OvalSports

    OvalSports Junior Member

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    Update:
    Installing 7mm wheel spacers on the front to counter the caliper adjustment did the trick.

    B256E660-3E25-479A-8502-F42F04B8E78F.jpeg
    View attachment 82865
     
    bambam 06 likes this.
  6. xeninworx

    xeninworx Member

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    Yeah the S550 hubs stick out further compared to the S197 hubs so the calipers on a S550 are recessed. This way Ford doesn’t have to use lower offset wheels to clear larger calipers. The S550 4 piston caliper is thicker than the 4 piston Brembos.
     
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