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:
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....