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  1. #1
    Been Around the Block
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    My own JK 'Big Brake' research:

    Everyone here has been so nice and welcoming that I wanted to try to give a little back. I figured we all could use some extra braking power for big tires, etc. There seems to be so much secrecy about the Teraflex kit and also the Jeep J8 brakes, so I've been doing some investigation, and I think I'm making progress. Please let me know if you guys are interested or if I'm just talking to myself so I don't waste time with posts if I'm beating a dead horse.

    1. I have contacted the company that produces the J8 Jeeps and they have been wonderfully helpful, up to the point where they are legally allowed to share info. So, they are clearing it with their legal guys and I should hear more info this week.

    2. I think I make have found the master cylinder that is used on the J8, and likely, the Teraflex upgrade. Check this link:

    Click here

    Take a look at the 2nd part listing (Part Number: MC391385 - Raybestos). It is for a Jeep JK with 13.07" rotors!!
    Now check the 7th part listing (Mopar Part Number: 68091278AB). It is for the BR6 brake package: a heavy duty package I've seen listed as used on the J8!!

    I am going to call Raybestos tomorrow to get the bore diameter and verify that the mounting base dimensions are the same. The cool thing is that if its the master cylinder Teraflex is using, it is in stock for $80, instead of the $190 Teraflex is selling it for. It would either be a 1 1/16th or a 1 1/8th inch bore diameter. A 1.25" diameter bore would be ideal, I think, and really give us some fluid movement for big calipers, but I'm going to have to hunt for a 1.25" bore MC with a bolt pattern to mate to our boosters.
    For $80 I might just buy one and check it out for the benefit of everyone on this forum.

    3. I verified with the installers for the J8 (they did volunteer this info freely) that the brake pads on the J8 truly are just late model Ram 1500 pads.

    4. So, if the master cylinder above is truly a bolt on fit with a larger bore, then I just have to hunt rotor and caliper specifics.

    I'll keep posting here if there is interest....
    Last edited by Majik; 04-16-2013 at 04:12 AM.

  2. #2
    Been Around the Block
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    Oct 2012
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    Update regarding my search for a master cylinder:

    Even though I haven't even finished checking the heavy duty/offshore JK master listed above, I may have found another option:

    99-2004 Dodge Ram 2500/3500 MC's appear to have the same bolt pattern, same thread size for the brake line attachment ports, and have a 1.25" bore! Have to check on the height of the reservoir to see if it hits the hood, and the push rod length.

    I love having options. This one, if feasible, should give considerably more flow than even the upgraded Teraflex (aka OEM BR6 heavy duty brake option master cylinder) unit.

  3. #3
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    Jan 2012
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    Reno eNVy
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    My own JK 'Big Brake' research:

    Color me interested. Nice work!

  4. #4
    Nothing but a Thing
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    Nov 2012
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    Murrieta, Ca
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    1,884

    My own JK 'Big Brake' research:

    Awesome job! Would love to see a write up if you pull the trigger on everything!


    Sent from my iPhone using WAYALIFE mobile app
    Betty - 2013 Black JKU Rubicon Unlimited
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  5. #5
    Nothing but a Thing
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    May 2012
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    Bourbonnais, Illinois
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    1,047

    Re: My own JK 'Big Brake' research:

    I would be very interested in this as well,as a brake upgrade is on my list.

    2011 JKU 3.5 R.E. Longarm lift.

  6. #6
    Been Around the Block
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    Oct 2012
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    Texas
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    Quote Originally Posted by Skid_Kid View Post
    Awesome job! Would love to see a write up if you pull the trigger on everything! p
    If I can get the details ironed out, you can count on it!!

  7. #7
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    Mar 2012
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    So Cal
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    My own JK 'Big Brake' research:

    I am in! Subscribed...
    Fortis, Fidelis, Reverens

    2013 Billet Silver JKUR
    EVO Enforcer W/ Flip Kit
    ATX Slabs wrapped in 37" Km2's
    Hardcore mall crawler

  8. #8
    Nothing but a Thing
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    Dec 2012
    Location
    Bondurant, Iowa
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    My own JK 'Big Brake' research:

    Yes, very interested

  9. #9
    Been Around the Block
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    Oct 2012
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    Oh, and I forgot to mention... I'm trying to dig up an upgrade option for the rear as well. Given the rear is a nice, healthy 12.4" diameter, I am going to explore keeping the size roughly the same, but going from a wimpy 0.5" thick, solid rotor, to something like a 1" thick, vented rotor and a small twin piston or large single piston caliper, if possible.

  10. #10
    Fresh Catch
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    Feb 2013
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    Hollister
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    29

    My own JK 'Big Brake' research:

    Good work I hope you figure it all out

 

 

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