PBR Cobra Calipers on 13" Rotors (1998 Mustang GT Convertible)

Discussion in 'Suspension and Brakes' started by vertmustang98gt, Apr 9, 2015.

  1. vertmustang98gt

    vertmustang98gt New Member

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    Hey all,

    I've been reading and getting conflicting answers on various forums, but I believe my setup should work.

    I recently purchased PBR dual piston Cobra calipers and these rotors:

    http://autoplicity.com/4884955-powe...-performance-drilled-and-slotted-brake-rotors

    It's going on a 98 GT and I've read that the GT PBR calipers won't fit on the 13" rotor but it's correct to assume my PBR cobra calipers would fit?

    Here's a setup for sale that states this, but of course Real World experience is better than what some "website" says.

    http://www.mpsautosalvage.com/sunshop/index.php?l=product_detail&p=4362

    Thank you for your help.
     
  2. lutter94

    lutter94 Well-Known Member

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    The autoplicity link looks like rear rotors, the photo definitely isn't 13".

    If you bought cobra dual piston calipers, they will fit 13" rotors, just make sure the calipers came with the bracket. its that simple. We are talking front axle correct?
     
  3. vertmustang98gt

    vertmustang98gt New Member

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    The photo was just for representation according to the caption.

    It is for the front and the calipers came with the bracket and loaded.

    I'm swapping them out for new pads though too.

    Here's the rotors, pads and hoses I went with (I hope it fits):
    Rotors:
    http://www.rockauto.com/catalog/moreinfo.php?pk=4418580&cc=1410578

    Pads:
    http://www.rockauto.com/catalog/moreinfo.php?pk=380853&cc=1410578

    Hoses:
    http://www.rockauto.com/catalog/moreinfo.php?pk=968029&cc=1410578
    http://www.rockauto.com/catalog/moreinfo.php?pk=968642&cc=1410578
     
  4. lutter94

    lutter94 Well-Known Member

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    Front brake lines should swap between 94-04 Cobra, and 99-04 GT/V6. You're safe there. Pads look good, rotors look good.
     
  5. lutter94

    lutter94 Well-Known Member

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    Wait, to get on the same page here, you have PBR calipers (dual piston, not cobra).

    Cobra and PBR aren't the same. PBR is intended for an 11" rotor, not a 13". It won't work, you need cobra calipers.
     
  6. vertmustang98gt

    vertmustang98gt New Member

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    This was the confusing part. They are PBR brand but say Cobra on them (cobra is raised metal).

    Do you know what I'm talking about?

    From my dive into forums I read that PBR manufacturered Cobra brakes as well. So I'm thinking these may be them?

    I'm not sure though so this is why I posted this thread.
     
  7. lutter94

    lutter94 Well-Known Member

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    These need 11" rotors
    [​IMG]

    These need 13" Sounds like this is what you have, and you should be good to go :thumbsup:
    [​IMG]

    94-98 Cobra - 38mm piston
    99-04 Cobra - 40mm piston
     
  8. vertmustang98gt

    vertmustang98gt New Member

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    Mine look exactly like the second one, thank goodness.

    Thank you for the help.

    My buddy said these came on the 03/04 cobras. Is that true?
     
  9. lutter94

    lutter94 Well-Known Member

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    measure the pistons, if its 40mm, they would be the same.
     
  10. vertmustang98gt

    vertmustang98gt New Member

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    Painted and ready to be installed:
    [​IMG]
     
  11. RichV

    RichV Well-Known Member

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    PBR is the manufacturer for both. The GT caliper is for the 11" rotor, the Cobra caliper is for the 13" rotor. But they do have the 'Cobra' 13" caliper without a logo.

    But from what you've posted, you should be covered. It will work, although you should do the rears and I don't think you need anything else since you have hydroboost. The early cars need a MC to be right as well.
     
  12. vertmustang98gt

    vertmustang98gt New Member

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    When you say do the rears you mean with Cobra brakes?

    It is my understanding the rear rotors are the same but the caliper is different.

    I was going to replace the rotor and pads thus leaving the GT caliper on the car.

    Let me know what you think.

    Everything I've read hasn't said this would be a problem.
     
  13. lutter94

    lutter94 Well-Known Member

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    The rear rotors are different, and the calipers are the same. Rear GT caliper/Cobra Caliper, same thing. you'll need bigger rotors, different brackets to relocate the caliper, and anti moan brackets for the caliper as well. New dust shields would be an option, and new lines are needed to reach the reorientated caliper.
     
  14. RichV

    RichV Well-Known Member

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    Yep, what lutter said. Rotors are bigger on the Cobra in the rear too.
     
  15. vertmustang98gt

    vertmustang98gt New Member

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    Any adverse effects if I only replace the pads and rotor with GT specs?

    Also, if I could find all the part #'s for each product it'd probably be helpful in comparing cost. I'm assuming doing the full Cobra upgrade can't be that much more expensive if I'm replacing the rotors anyway.

    Thanks for your help guys.
     
  16. lutter94

    lutter94 Well-Known Member

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    I upgraded the fronts to 13" Cobras. And redid the rears with new GT pads/rotors. I did put the cobra master cylinder in it, this is before hydroboost brakes was a thing. Doesn't affect you, (95% sure).

    Here's a kit for the full upgrade. http://www.americanmuscle.com/mustang-rear-brake-bracket-kit.html

    You can find stuff on ebay and such too. And this guy makes new caliper brackets. If I can get my hands on a machined bracket, I was going to make myself a pair at work. Just flat steel laser cut and bent. You'll still need to find some anti moan brackets, apparently they do make a difference. Keep in mind, the axles have to be pulled since the caliper mount brackets mount behind the axle onto the axle housing.

    North Race Cars - Aftermarket Brackets http://www.northracecars.com/Brakes.html
    [​IMG]
     
  17. lutter94

    lutter94 Well-Known Member

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  18. vertmustang98gt

    vertmustang98gt New Member

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    You've been a huge help. I'm glad I have this to go off of, if necessary.

    I'm thinking I'm just going to replace the rotor with GT specs and pads.

    I'll ask again, I know it won't be as balanced but do you foresee it being a huge issue with having Cobra front brake/rotor specs and GT rears?
     
  19. lutter94

    lutter94 Well-Known Member

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    Not a problem. Mine seems fine, I'd like to eventually upgrade, but at a budget, lol. I've been replacing with SS lines too, so right now my fronts are SS, and the rear SS lines are made for a Cobra, so I can't use em yet, lol. I did a ton of research this spring on the subject, so everything's still pretty easy to remember, lol.