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ATS Brembos on SN95 spindles - no spindle mod

Discussion in 'SN-95 and New Edge Mustangs' started by Mustang5L5, Aug 27, 2019.

  1. Mustang5L5

    Mustang5L5 Active Member Established Member

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    This is a continuation of the discussion seen here in this thread in the Terminator forum

    https://www.svtperformance.com/threads/installing-ats-brembos-on-the-cobra.1175014/

    I took a different path in trying to mount these calipers without modifying the SN95 spindle. To bring everyone up to speed that is not familiar with this mod, the Cadillac ATS (not the ATS-V) features a 4-piston Brembo caliper mounted on an 11.6" rotor. WIth some slight mods, it can be made to fit the Mustang. Read the above thread to see what these mods are

    There were a few mods I wasn't willing to do to my car. #1 was slot the spindle. I had some concerns with how this was done, as well as preventing me from changing my calipers out in the future if I decided to get, say. Baer 6S calipers. SO I wanted to avoid that.
     
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  2. Mustang5L5

    Mustang5L5 Active Member Established Member

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    One feature on the ATS caliper was that the threaded mounting bushing was a separate entity from the caliper pressed into the body. The GM calipers are a 128mm bolt spacing with an M14 bolt. The SN95 uses 130mm spacing and M12 bolts
    IMG_5438.JPG
    IMG_5437.JPG
     
  3. Mustang5L5

    Mustang5L5 Active Member Established Member

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    They tap out rather easily. Insert an M14 bolt and tap from the backside and they pop right out.

    IMG_5531.JPG


    Using Solidworks, I modeled up an insert with the appropriate M12 threaded hole and offset, and machined up a set of 4
    IMG_5532.jpg

    EA9D9BE0-3DF9-4777-8D67-4F8BC2D147B0.jpeg.jpg
     
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  4. Mustang5L5

    Mustang5L5 Active Member Established Member

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    Using a press, I pressed them into the caliper, and now, the caliper is a 100% bolt up modification.

    You can see the offset M12 threaded hole clears the hole in the caliper body nicely.
    4EE138BB-9B8F-4590-8BE6-63DEE990A30B.jpeg.jpg
    3D082197-3E9F-4170-ACCA-3D2E23F55314.jpeg.jpg
     
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  5. lowranger96

    lowranger96 Active Member Established Member

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    Same thing I did although i went a little further and moved the caliper in towards the rotor so the pad contacts the rotor correctly. I added the set screw to ensure they never move. Have close to 2000 miles on them so far. c9ff06fda40c309b3db423189fb00e05.jpg
     
    Last edited: Aug 27, 2019
    94 Cobra R and Mustang5L5 like this.
  6. lowranger96

    lowranger96 Active Member Established Member

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    Double post
     
  7. Mustang5L5

    Mustang5L5 Active Member Established Member

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    SO, what's next. There are still a few modifications needed that i'm trying to work around.

    #1, the caliper offset. Approx 0.075" needs to be machined off the face of the mounting flange where the caliper bolts to the spindle to help center it on the 13.1" Cobra rotor. I have not done this yet because there are a few rotors i'd like to try out first to see if this can be avoided, but to mostly avoid #2

    #2. The ATS uses 11.6" rotors. The pad contour doesn't exactly match the larger 13.1" cobra, so there's a bit of pad overhang on the top. This is shaved off, but I want to avoid that. So there are a few rotors to try out here. See below.



    I did a test fit with the Corvette Z51 13.4" rotor. I had an old hub that I pounded the lugs out. I then mounted the rotor and caliper. It barely makes contact. It's probably .1-.2" too large in diameter to work here (in addition to wrong lug pattern). However, it appear the top area of the pad would contact the rotor fully, but the bottom edge would not be in full contact.
    IMG_5643.JPG

    Other rotors to try. The '11-'14 base Mustang GT rotor. It's 13.2" in diameter.
     
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  8. Mustang5L5

    Mustang5L5 Active Member Established Member

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    That's actually a great idea. Did you clearance the hole in the caliper body as well, or did the offset, and relocation inward put the threaded portion inside the hole on the Al body as well?

    I like the idea of a set screw as well.
     
  9. lowranger96

    lowranger96 Active Member Established Member

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    A small amount of grinding is necessary for clearance but it’s not much at all.
     
  10. lowranger96

    lowranger96 Active Member Established Member

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    ed86f0187c9cc4a34e6738a48d82b600.jpg

    471f11ec3b38e4b505a4a269c62089e4.jpg
     
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  11. Mustang5L5

    Mustang5L5 Active Member Established Member

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    Just some visuals of some of the challenges.

    Rotor alignment. I believe the number thrown around was to shave 0.070” off the mounting face of the Caliper flange to center the rotor in the groove.

    CB3E8A83-39BB-439D-AE1B-19B4F3DFB737.jpeg
    9E48EF46-BDA3-476C-AEF0-B418C793AF5D.jpeg
    FD78A183-5AD5-4A7E-871C-0B6840757627.jpeg
     
  12. Mustang5L5

    Mustang5L5 Active Member Established Member

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    And Caliper distance from center of rotation. You can see how much the pad overhangs.

    CBA61448-4ED9-46BE-9500-F90F377AD1F4.jpeg
     
  13. Mustang5L5

    Mustang5L5 Active Member Established Member

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    Finally, I test fit some 17x8 wheels I had. None fit. The Caliper contacted the barrel of the rim preventing it from mounting properly.

    Plenty of clearance to the spokes, but It appears that 18” wheels are required unless the Caliper can be pulled in a tad.

    Same result with 97 cobra, 98 cobra and bullitt wheels

    3DEEF903-BBC0-45F7-B316-AD45052BBE35.jpeg
    3177B4F9-EBBD-40ED-B4F4-42DD7E3BEA5D.jpeg
     
  14. lowranger96

    lowranger96 Active Member Established Member

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    Pull the caliper in, my setup fits multiple 17" wheels including oem cobra 17s
     
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  15. Mustang5L5

    Mustang5L5 Active Member Established Member

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    Going to have to, but that will require Rev B to the inserts to allow for it to come inward slightly.

    Before I do that, I want to test fit an '11-14" 13.2" rotor.
     
  16. SilverGT1

    SilverGT1 Active Member Established Member

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    I think the hat height of the 13.2 rotor is going to be a problem.
    SN95 is 1.7”
    S197 is 1.9”
     
  17. Mustang5L5

    Mustang5L5 Active Member Established Member

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    You are right. That won’t work. Really need something with a 1.6” hat height

    Back to the drawing board
     
  18. lowranger96

    lowranger96 Active Member Established Member

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    I 3D printed my inserts before I sent them to machine shop :) I’m using 2mm shim behind the cobra rotor since I couldn’t find the perfect rotor. That and most people already have cobra rotors (heck they are only like $40 on rockauto now)


    Sent from my iPhone using Tapatalk
     
  19. SilverGT1

    SilverGT1 Active Member Established Member

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    Where did you find your 2mm shims?
     
  20. lowranger96

    lowranger96 Active Member Established Member

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    I drew them and had local machine shop water jet them out for the batch of these kits I’m having made. If you need some made let me know


    Sent from my iPhone using Tapatalk
     
    Last edited: Aug 29, 2019

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