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Installing ATS Brembos on the Cobra.

Discussion in 'Terminator Talk' started by GodStang, May 27, 2019.

  1. SilverGT1

    SilverGT1 Member Established Member

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    You could look at another option. Have a look at the Power Stop JBR1529XPR. It is the right mounting pattern and is 13.4". Hat height is 2.2". You would have to make up a lot of space to bring it back out to match the 1.7" Cobra rotor.
     
  2. Mustang5L5

    Mustang5L5 Active Member Established Member

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    I ordered a single cheap Z51/J55 rotor. Lets see how it fits up
     
  3. 94 Cobra R

    94 Cobra R Same Ol Same Ol Premium Member Established Member

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    He didn’t change his name, he just has multiple profiles.
     
  4. Comp04svt

    Comp04svt Active Member Established Member

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    Just installed my setup last night. Huge difference in braking IMO. Brakes are much more responsive, feel is way better and they are far far more eager to lock up the tires/engage ABS. Plus they look killer!

    Power stop Z26 pads
    Stop tech lines
    Eradispeed rotors refinished


     
  5. GodStang

    GodStang Well-Known Member Established Member

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    Looks fantastic! Also those are my dream wheels!
     
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  6. Comp04svt

    Comp04svt Active Member Established Member

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    Thanks!! Well now you can pick up a set cause you know they clear the Brembos' ;)
     
  7. SilverGT1

    SilverGT1 Member Established Member

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    Did the Power stop Z26 pads need to be trimmed down as much as noted in post #1?
     
  8. Comp04svt

    Comp04svt Active Member Established Member

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    Any brake pad is going to be the same size regardless, as it is designed to fit the same car. So any pad you purchase will need the same amount of trimming.
     
  9. SilverGT1

    SilverGT1 Member Established Member

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    FWIW, I just spoke with Porterfield Brakes and they will custom size any of the brake pads they carry. They have Hawk, Pagid, Performance Friction, Porterfield and Raybestos.

    I asked about trimming the ATS / Brembo pads. Cost is about $30 for the set. If your going to buy performance pads anyway, and you don't want to deal with cutting down the material, this might be a good option.

    :: #1 Race Specialist in The World :: �

    I had them do a set of Raybestos ST-47 and ST-43 for me before. Quick service. If you call, you get a real live human and they know their stuff.
     
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  10. SilverGT1

    SilverGT1 Member Established Member

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    If anyone is looking for a good price on the calipers, I just bought mine from Scoggin Dickey for $116.62 each. No tax and free shipping.
     
    Last edited: Jul 26, 2019
  11. Mustang5L5

    Mustang5L5 Active Member Established Member

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    Anyone ever though about pulling the steel insert out and machining up a set with m12 threading and offset to match the sn95 spindle?

    I think the bolt spacing is only off 1mm, so plenty of room to offset the bolt holes.

    I may try this method, as I don't want to modify the spindle
    IMG_5435.JPG

    As you can see, there is room to play with if you step down to the 12mm bolt size from this
    IMG_5438.JPG

    Just need to get this insert out and I can model one up in CAD. I also need to find out the exact bolt spacing of the GM spindle and SN95. I *think* it is 1mm off

    IMG_5437.JPG
     
  12. SilverGT1

    SilverGT1 Member Established Member

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    I was just contemplating this today. I think I am just going to modify the mounting on the spindle like the OP did as I don't plan on going backward to the original calipers. I think in the end, it is faster and easier. It doesn't sound like he had to take too much more material off as he did it with at rat tail. It would be interesting to know what his final size was. Based on that, maybe just size up the bit from the 9/16.
     
  13. Mustang5L5

    Mustang5L5 Active Member Established Member

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    Got my J55 rotor in and confirmed a few measuremts.

    They fit in the rotor channel of the brembo...barely. So the Caliper offset needs to be spot on.

    Hub diameter measures out the same as the sn95 hub.

    So, I need to To drill the lug pattern for SN95 before going further. Potential issue is that since the ATS rotor is only 12.6" in diameter, going with a larger rotor may cause it to contact the front and rear of the rotor channel before the entire pad area covers the rotor..if you can picture what I am referring to.

    Thes are 13.4" by 1.25" thick. I paid $28 for this rotor from rockauto
    IMG_5444.JPG
     
    Last edited: Jul 27, 2019
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  14. SilverGT1

    SilverGT1 Member Established Member

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    As you know, the only potential issue with removing the material is hitting the internal crossover passage. Has anyone here taken one of these calipers apart? It would be nice to know how much material you're working with.
     
    Last edited: Jul 27, 2019
  15. blwn03sonic

    blwn03sonic venomous motorsports Established Member

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    There’s a thread on 03-04 advice page on Facebook. There’s a guy with ccw classics who said they clear. [​IMG]


    Sent from my iPhone using Tapatalk
     
  16. blwn03sonic

    blwn03sonic venomous motorsports Established Member

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    There’s a thread on 03-04 advice page on Facebook. There’s a guy with ccw classics who said they clear. [​IMG]


    Sent from my iPhone using Tapatalk
     
  17. blwn03sonic

    blwn03sonic venomous motorsports Established Member

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    There’s a thread on 03-04 advice page on Facebook. There’s a guy with ccw classics who said they clear. 6ac10e3028cc1ee24eeb281a16989fc6.jpg


    Sent from my iPhone using Tapatalk
     
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  18. blwn03sonic

    blwn03sonic venomous motorsports Established Member

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    There’s a thread on 03-04 advice page on Facebook. There’s a guy with ccw classics who said they clear. [​IMG]


    Sent from my iPhone using Tapatalk
     
  19. Mustang5L5

    Mustang5L5 Active Member Established Member

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    I played around with this over the weekend on a bench with some spare spindles and rotors. Not sure I'm going to continue much further with it.

    I know guys are running these, but my criteria was no spindle mods, and no brake pad shaving.

    The ATS uses a 12.6 rotor and the Caliper is designed for that radius. You can see here on the 13.1 cobra rotor the different radius
    IMG_5464.JPG

    The 13.4 rotor doesn't fit well. Since the radius of the Caliper is for a smaller rotor, the arc of the larger rotor causes it to come very close to hitting (if it didn't skresdy) the front and rear of the Caliper body. The result is you'd still need to shave some of the pad after machining the rotor to fit.

    Here's the Caliper resting on the 13.4 rotor and you can see the pad still overhangs.
    IMG_5461.JPG

    The cobra 13.1 rotor does fit in the Caliper and allow an unmodified pad to fully contact the face, but you'd need to modify the spindle to located the Caliper down about 8mm towards the center of rotation. Not easy to do.

    IMG_5465.JPG

    Playing with CAD, the inserts on the Caliper can be removed and designed with a shift of 0.5mm to match the GM bolt spread (130mm on the SN95 and maybe 131mm on GM) and shift it about 0.5mm closer to hub. Not enough to bring the pad on the rotor face.

    I know the Subaru guys do this mod too on 12.8 rotors and complain about pad overhang as well.

    So I'm going to stop here, return my j55 rotor and put my $50 Caliper on a shelf as a paperweight for now. I know these can be made to fit, but I don't want to do some of the modifications required too. In 10 years or so when I'm 50 I want to be able to order an off-the-shelf pad or rotor and put it in without modification, or change to a different braje setup without having to replace my spindle
     
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  20. Street Warrior

    Street Warrior SVT Power Established Member

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    LOL, I'm 49 and I did this!
    Great research regardless and I understand your point since I don't see myself in making any brake changes in the future.
     

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