2g easy brake upgrade using cobalt ss turbo brembo monoblock calipers

Posted by sleeperX2013, Mar 19, 2014
Maintenance & Repairs - Oil choices, timing belt, setting timing, CV boot replacement, alternator servicing, fuse/relay checks, and other basic maintenance, repair and diagnosis discussions.

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  1. sleeperX2013

    sleeperX2013 Proven Member Omaha, Nebraska

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    So yeah guys thought I would share this with you. Cobalt ss turbo brembo monoblock calipers 30 minute upgrade. All you need is the calipers bolts and a die grinder with a small diameter metal bit. These calipers almost bolt directly on the 2g front spindles . You need to awl out one of the factory spindle holes for the factory 2g caliper bracket about an 1/8 of an inch and then they bolt right on. You can use factory rotors like I have pictured as of right now, but you have room for evo 8 / 9 rotors which I will be doing as soon as they arrive. I figured out all of this by mistake and am very pleased with the upgrade. It literally took me 45 minutes for both sides
     
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  2. sirbow2

    sirbow2 Proven Member Rapid City, South_Dakota

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    spose we cant post in the tech article forum yet :( this would be great for there. you wouldn't happen to have any pics of it, would you?
     
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  3. sleeperX2013

    sleeperX2013 Proven Member Omaha, Nebraska

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    #3
  4. gieri002

    gieri002 Proven Member Lake Minnetonka, Minnesota

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    Wow, great find. This changes the game.
     
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  5. evileagleawd

    evileagleawd Proven Member Vineland, New_Jersey

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    I checked out your pics and you mounted your calipers up side down. The bleeder needs to point up.
     
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  6. sleeperX2013

    sleeperX2013 Proven Member Omaha, Nebraska

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    Evileagleawd thank you for your advice. I didn't know that I just figured to point them downward to keep from getting fluid on the finish. But now thinking mechanically that makes perfect sense because all the air would sit at the top......duh! Lol thanks
     
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  7. okm12346

    okm12346 Proven Member Sea Isle City, New_Jersey

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    Good find. Keep us updated on the evo 8 rotor fitting.
     
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  8. sleeperX2013

    sleeperX2013 Proven Member Omaha, Nebraska

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    I definitely will. Does anyone know the diameter of the evo rotors and 2g rotors? Because I have another 5/8 of an inch clearance between the calipers and rotors which will allow me another inch diameter of rotor
     
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  9. okm12346

    okm12346 Proven Member Sea Isle City, New_Jersey

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    Stock 2g GSX'99 is equipped with:
    FRONT:
    - vented rotors diam275mm (10.8") = MR389727/MR449818
    - 2-piston calipers (Sigma) = MB950176 & MB950177
    REAR:
    - regular rotors = MB928716
    - 1-piston calipers = MR129583 & MR129584

    EVO-5,6,7,8,9 (possibly 10?) is equipped with:
    FRONT:
    - vented rotors 320x32mm (12.59"x1.25")
    - 4-piston calipers
    REAR:
    - vented rotors 300x20mm (11.8"x0.78")
    - 2-piston calipers

    [​IMG]
     
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  10. InTheDeTaiLs

    InTheDeTaiLs Probationary Member Duluth, Minnesota

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    What is the distance from bolt hole to bolt hole on the Colt caliper?
     
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  11. gieri002

    gieri002 Proven Member Lake Minnetonka, Minnesota

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    Front Evo 8 rotor diameter: 320mm
    Front 2g awd rotor diameter: 276mm


    Edit: Nice, you beat me to it.

    It looks like the rotors on the 08+ cobalt SS with brembos have a diameter of 315mm (12.4")
     
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  12. cait sith

    cait sith Proven Member Brooklyn, New_York

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    What a neat little surprise. It doesn't shock me that some other car uses the same brake caliper mounting hole dimensions, but it's nice to know that you can throw these on with no sweat. You could probably fit EVO rotors without a problem.
     
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  13. sleeperX2013

    sleeperX2013 Proven Member Omaha, Nebraska

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    Hmm? Idk if I'm going to be able to fit the evo rotors on there but I do have a guy that could machine down the diameter of the rotor to make it fit . I'll keep you posted on the outcome
     
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  14. synthetek

    synthetek DSM Wiseman La palma, California

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    If the EVO rotors are too big the outlander rotors might work they are 296mm
     
    #14
  15. sleeperX2013

    sleeperX2013 Proven Member Omaha, Nebraska

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    Did some research and the cobalt rotors are 290mm (11.6") so it looks like I could use those as long as they're not too different from the dsm hub. I'll try a set from the parts store and see what happens.
     
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  16. miliman13

    miliman13 Proven Member tampa, Florida

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    1st off, awesome find, what do you mean by accident ?
    and what does " awl " mean ? im not familiar with the term.
    did the stock 2g lines fit with no issue?-thanks.
     
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  17. InTheDeTaiLs

    InTheDeTaiLs Probationary Member Duluth, Minnesota

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    What is the distance from bolt hole to bolt hole on the Colt caliper?
     
    #17
  18. Yamahaulin

    Yamahaulin Proven Member Bowling Green, Kentucky

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    Evo 8/9 is 12.8 and I believe 2g is 10.6
     
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  19. gieri002

    gieri002 Proven Member Lake Minnetonka, Minnesota

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    That's not what I found...

    2009 Cobalt SS rotor size? - Cobalt SS Network
     
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  20. sleeperX2013

    sleeperX2013 Proven Member Omaha, Nebraska

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    Miliman13 what I meant by accident was my buddy had these calipers laying around his garage, and I borrowed them to see if I could make a bracket to use these on my 2g. When I took my oem caliper and bracket off I lined the two mounting surfaces up and noticed that the brembos were only off by an 1/8 inch or so . So I started mocking them up and came to the conclusion that all I had to do was awl/ notch one of the holes on the spindle and they were a direct bolt on. And to answer your other question the factory line works perfectly using the brembo banjo bolt and crush washers. :thumb:
     
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  21. dot45

    dot45 Supporting VIP Oak Park, Michigan

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    Just to be clear, you elongated one of the holes in the spindle?

    I already have the j-spec knuckles for my evo brakes (if the weather ever warms up.....)

    I don't think I would feel at ease, knowing that one of the fasteners holding my caliper to the car is riding in a slot.
     
    #21
  22. miliman13

    miliman13 Proven Member tampa, Florida

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    LOL:thumb::thumb:LOL
    so these would be the same? $_3.JPG any idea if the years differ ?
     
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  23. GPLaserRS

    GPLaserRS Proven Member Grosse Pointe, Michigan

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    The rotor the Cobalt uses is 12.4" in diameter, the problem you'll run into is that to use the cobalt rotor the hub is 5x110. We run 5x114.3. I did find the calipers on RockAuto for $105/caliper including the core charge. You're gonna need to measure what size rotor you need to run because the spacing from the hub center compared between the Cobalt and a DSM is going to be different. But this is definitely an awesome find!
     
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  24. miliman13

    miliman13 Proven Member tampa, Florida

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    ya, lets find out. These are a way cheaper alternative; concluding from a quick ebay search
     
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  25. okm12346

    okm12346 Proven Member Sea Isle City, New_Jersey

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    the 94+ 3000gt vr4 rotors are 314mm
     
    #25

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