My own JK 'Big Brake' research:

were you able to get the mock up done? the anticipation is :icon_crazy: if I lose any more eyebrow hairs I'll have to get the Sharpie out :cheesy:
 
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jeeeep said:
were you able to get the mock up done? the anticipation is :icon_crazy: if I lose any more eyebrow hairs I'll have to get the Sharpie out :cheesy:
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LOL. Sorry. Will try to get the pics up tonight. The mock up pics are a few pages back. The only thing I haven't posted are my drawings of the adapter bracket I've sketched and measured for. Gonna try and get one machined in the next few days...
 
New wheels just arrived! Hutchinson RMs. Backspace is 4.63" on these, so now I can start my axle builds and use these wheels to mock up the brake caliper spacing issue! Can't wait to get home from work and see those wheels!!

I'm thinking I will probably still add a 1" spacer, but that is for other reasons not brake related...
 
Majik said:
New wheels just arrived! Hutchinson RMs. Backspace is 4.63" on these, so now I can start my axle builds and use these wheels to mock up the brake caliper spacing issue! Can't wait to get home from work and see those wheels!!

I'm thinking I will probably still add a 1" spacer, but that is for other reasons not brake related...
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Love to pick your brain on brake choices for my rear axle build.. I know very little about brakes, but like you, I'm a dad and always have my little girl with me so to me braking is a big deal that can't be over done..
 
rws said:
Love to pick your brain on brake choices for my rear axle build.. I know very little about brakes, but like you, I'm a dad and always have my little girl with me so to me braking is a big deal that can't be over done..
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I agree, and happy to help!! If you think the questions are pertinent to this project, just post em here. If out of scope, just PM me and I'll be happy to chat!

Adam
 
So I'd like to apologize to all of you following my little project for being out of the loop the last week. One of my kids has been sick and I've worked 12+ hour shifts the last five days, so my plans changed... tomorrow I'm hoping to do a little new work and update everyone. Gotta get the caliper bracket made ASAP!! Especially seeing that my new wheels are sitting in the hallway! LOL!
 
Subscribed and looking forward to having better brakes to stop my 37's :clap2: I'm a do it your self guy so really interested in this, and rear vented discs would be "cool" :brows:
 
Majik said:
So I'd like to apologize to all of you following my little project for being out of the loop the last week. One of my kids has been sick and I've worked 12+ hour shifts the last five days, so my plans changed... tomorrow I'm hoping to do a little new work and update everyone. Gotta get the caliper bracket made ASAP!! Especially seeing that my new wheels are sitting in the hallway! LOL!
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well priorities first but... there is an owner expiration date on all Jeep related stuff and then all that neat stuff in the hallway has to be delivered to me! looking forward to the updates :beer:
 
jkbud said:
Another week has passed and nothing new? :idontknow:
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I'm sorry... life just hit me hard the past two weeks. Sick kids, work schedule swaps... the list goes on. I promise I'm not quitting the project! I've already got an adapter bracket drawn up. Just haven't had the time to get it over to the machine shop.
For a little update:
The bracket thickness, if I was to keep it really simple with the correct offset, comes out to roughly 0.400 inch. I really wanted the bracket thickness at as close to 1/2" as possible. I started some bending moment calculations (ugh... that brings back memories of statics exams from college!) but then stopped when I realized something: a caliper bracket mounted is subjected to very little bending stress. If you picture how a caliper is subjected to forces it makes more sense. When the brakes are applied, the caliper is essentially trying to be 'dragged' forward with the rotor. Which means the caliper bracket is primarily in a shearing arrangement. This is good. Why am I rambling? To justify that in shear, a plate of steel approx (for argument purposes) 6" x 2" in size that has two parallel rows of two holes drilled in it, placed in shear along these two pairs of holes, needs a massive force to deflect. Sooooo. I'm confident that my roughly 0.400" thick steel adapter plate will likely manage well.

However...to inspire even a bit more confidence, I am going to try to get this machined out of chromoly instead of just plain mild steel.

Sound good? :) :thumb:

BTW, the reason this thickness issue is critical is because if the adapter bracket has to be machined with an additional offset into it, a few issues arise:
1. Machining cost goes up a bunch. Like 2-3 times per bracket.
2. The offsets will introduce stress risers into the bracket which become point for potential failure. I don't like failure. :)

So, a simple flat plate adapter is ideal. And I think I've got it figured out!
 
Notajerryskid said:
Man I'm dying to get the final 411 on this. I really appreciate you doing all this. :beer:
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No problem! I appreciate all of you guys being patient with my trying to do such research around my daily life! :thumb:

And BTW, I think I've got a piece of 3/8" lexan plate laying around that I just might shape into a rough adapter bracket as a trial... maybe later tonight after the little ones go to bed!
 
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So. doing some digging on my own. Here are the parts list for the Aulstrailan and eouope jk's. they come with 13.25 brakes. :brows: all mopar, and all can be bought here.

68040177AA - 13.25" Rotor
68044865AA - Caliper Adaptor
68044863AA - RH Caliper
68044862AA - LH Caliper

Only down side is the JK8's have 5.5x5 lug's.
 
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I'm anxiously awaiting your findings, too. I run Spyderlock bead locks, so my backspacing is 3.5" - ie plenty! I need help in the braking department in a BIG way. Thanks for all the work!
 
I believe this is the complete kit for the 13inch JK that is oem. :brows:


68044865AA ADAPTER, DISC BRAKE CALIPER $27,99 x2
68049018AA PIN KIT, DISC BRAKE $6,99 x2
68044862AA CALIPER ASSEMBLY RIGHT $70,99 x1
68044863AA CALIPER ASSEMBLY LEFT $70,99 x1
68044866AA (new) 68044866AC PAD KIT FRONT $152,99 x1
68040177AA 13" ROTOR FRONT BRAKE $85,99 x2
68045998AB Master Cylinder new# 68091278AB $101.99 x1
68045999AB BOOSTER, Power Brake $121.99 x1

The only problem is that you have to order the parts and wait 2-3 weeks for delivery (or at least I haven't found anyone with these parts in stock).
PS: The Booster & Master Cylinder are the BR6 parts from the 2011+ JK models ;-)
 
Notajerryskid said:
I believe this is the complete kit for the 13inch JK that is oem. :brows:


68044865AA ADAPTER, DISC BRAKE CALIPER $27,99 x2
68049018AA PIN KIT, DISC BRAKE $6,99 x2
68044862AA CALIPER ASSEMBLY RIGHT $70,99 x1
68044863AA CALIPER ASSEMBLY LEFT $70,99 x1
68044866AA (new) 68044866AC PAD KIT FRONT $152,99 x1
68040177AA 13" ROTOR FRONT BRAKE $85,99 x2
68045998AB Master Cylinder new# 68091278AB $101.99 x1
68045999AB BOOSTER, Power Brake $121.99 x1

The only problem is that you have to order the parts and wait 2-3 weeks for delivery (or at least I haven't found anyone with these parts in stock).
PS: The Booster & Master Cylinder are the BR6 parts from the 2011+ JK models ;-)
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So you don't need the booster and master cylinder if you have a 2013?
 
For the most part, yes...those are the part numbers that I've found for the 13" version, i.e. non-US version, and if you are needing to upgrade immediately, then that is a good option to start with. It is basically a similar if not the same setup that TF is packaging. I think I will be able to get a MUCH better performing package together. You will probably gain 10-15% in braking torque with the 13" BR6 parts. With the setup I'm constructing, I'm guesstimating 50-60% more braking capacity. BIG difference. The rotors are 14.2" instead of 13", and the calipers are massively bigger. And best of all, the price of the whole thing will be very similar. I'm really close to having the front all figured out. Sorry for the suspense :) I promise it will be worth it ;)
 
This is some fantastic research and more of a reason why I don't like TR if this was Evo they wud just tell you what to buy but TF is all about money not quality products and making the customer happy.


Sent from my JK
 
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