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Old 06-25-2013, 01:36 PM   #1
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New TeraFlex JK Performance Rotor Kits



TeraFlex JK Wrangler Performance Big Rotor Kit
TeraFlex Inc., manufacturer of TeraFlex suspensions, body protection equipment, low range gearing and HD axles, introduces the newest performance component for the JK Wrangler.

The TeraFlex JK Performance Big Rotor Kit is the perfect upgrade for JK Wrangler owners requiring increased braking performance for 33-35” tires.
This kit allows the factory brake caliper and brake pads to be retained, while increasing the rotor diameter from 11.9” to 13.3”. The increased clamping distance from the rotor center results in greater braking leverage to allow stopping distance to be decreased substantially (larger rotor diameter = greater stopping power). The simple bolt-on installation upgrade requires absolutely no brake line modification or brake bleeding, and can be installed with basic hand tools.

Product Features & Benefits:
• Brake caliper relocating anchor bracket
• 13.3” slotted rotor for superior stopping performance
• Mill-balanced vented rotors for maximum heat dissipation
• Improved braking performance over factory brake system
• Retain factory brake caliper & pads
• No brake bleeding or brake line modification required
• 100% bolt-on upgrade for easy installation
• A minimum of a 17” wheel must be used with this kit


TeraFlex JK Performance Rotor Kit
Part# 4303480
MSRP $289.99

Includes:
• 13.3” mill-balanced performance vented rotors (qty 2)
• Brake caliper relocating anchor brackets (qty 2)


TeraFlex JK Performance Slotted Big Rotor Kit
Part# 4303490
MSRP $311.99

Includes:
• 13.3” mill-balanced performance vented & slotted rotors (L & R)
• Brake caliper relocating anchor brackets (qty 2)

Great write up on how to install either kit here: TeraFlex Performance Rotor Kit - write-up and impressions

TeraFlex products are available direct, or through authorized TeraFlex Dealers. For a complete list of Dealers in your area, or to purchase direct, contact TeraFlex at 801-288-2585 or visit them on the web, TeraFlex - Upgrade your Jeep | TeraFlex Suspensions.

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Old 06-25-2013, 01:47 PM   #2
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looks like a nice upgrade
are they in stock yet?

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Old 06-25-2013, 02:03 PM   #3
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Great. Something else from TF that I want to buy. LOL
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Old 06-25-2013, 02:27 PM   #4
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Yup we do have them in stock and ready to go.
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Old 06-25-2013, 02:31 PM   #5
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Thats a really great idea...clever! I would love to run these in the future; you guys have become very innovative!

How do the rotors wear over time? I assume the minimal difference in rotor vs. pad radius is so minimal it doesn't matter!

Need a test mule who drives a lot?

Is there going to be a matching rear setup?
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Old 06-25-2013, 02:33 PM   #6
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Nice! I haven't looked at brake upgrades yet but these seem like a pretty straightforward and simple design.
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Old 06-25-2013, 02:41 PM   #7
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I had been doing these type of brake upgrades on VW's for years, swapping them out for larger Audi TT rotors and caliper brackets. Upgrading to a larger rotor and spacing out the caliper does help with the braking, coupling this kit with a nice set of stainless brake lines, you'll have a nice little brake upgrade. I'm going to add this to the mod list.

One important question I have is where can we source the rotors? In my example I was using factory Audi rotors. Nothing special and extremely easy to find when you need new brakes. Are these rotors exclusive to Teraflex or can they be purchased off the NAPA shelf?
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Old 06-25-2013, 02:48 PM   #8
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do you make front and rear kit or is this a front only
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Old 06-25-2013, 03:27 PM   #9
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You don't really need larger rear rotors. The bulk of the stopping power comes from the fronts.
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Old 06-25-2013, 03:34 PM   #10
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No word yet if the Engineers are working on a rear upgrade. Matador, we have these specifically made for us so I am not sure if there is a comparable stock rotor. Besides the stainless lines you suggested maybe also slap on some aggressive pads too.
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Old 06-25-2013, 03:40 PM   #11
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You don't really need larger rear rotors. The bulk of the stopping power comes from the fronts.
Agreed, but visual balance (not necessarily the same size) would be nice.
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Old 06-25-2013, 04:27 PM   #12
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A couple of questions. I assume the better braking comes not because of a change in sweep area (since the stock calipers and pads are retained) but because of the leverage advantage of having the calipers farther from the center of rotation? I also assume that the larger rotors are heavier, which would mean a greater thermal mass and a better ability to absorb the heat generated while braking?

Have ya'll done any tests (side by side comparisons) with, say, 6 hard stops from 60 mph to zero and then used an IR non-contact thermometer to measure rotor temp differences between a stock JKU and one equipped with this kit?

Lastly, do you recommend (or have you even looked into it) a brake pad with a slightly higher MOT (mean operating temperature) so that you can take full advantage of the increase capability that this rotor adds.

To be clear, I still think this is a worthwhile upgrade, but I can see some (including possibly myself) wanting this if I choose to "push" the rated tow capacity of a JKU. The issue (mostly) as I understand it is brake capability, which this upgrade should help, as long as the pads can take it.
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Old 06-25-2013, 05:30 PM   #13
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You are correct they are gettign the advantage from area and not sweep area. You are also correct about the thermal mass of the rotors, ship weight on the kit is 58lbs. I do not know if they have done IR tests on the rotors, my guess is no as they are mostly looking at breaking distances not thermal absorption. And lastly you are correct upgrading the pads to a higher MOT and even something with a more aggressive bite would be worth while. We didn't include pads so that customers could choose the ones they liked most and to help keep the cost down.
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Old 06-25-2013, 10:17 PM   #14
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You are correct they are gettign the advantage from area and not sweep area. You are also correct about the thermal mass of the rotors, ship weight on the kit is 58lbs. I do not know if they have done IR tests on the rotors, my guess is no as they are mostly looking at breaking distances not thermal absorption. And lastly you are correct upgrading the pads to a higher MOT and even something with a more aggressive bite would be worth while. We didn't include pads so that customers could choose the ones they liked most and to help keep the cost down.
First, thanks for the answers. Second, I think your kit is an excellent cost effective solution and as soon as get colors sorted and my '14 ordered I'm buying one.

With that out of the way, stopping distances should not show a difference with cold pads (given both are full antilock stops). And any difference in stopping distances (I think) could go either way, depending on how the different front bite effects brake balance (meaning I could see your kit actually making it a bit longer). Once things get hot, I think (at the same rotor/pad temp) your kit would be better because of increased mechanical advantage. And, your kit (given the thermal mass improvement) might also not get as hot as quickly--another advantage. [Given that the advantage (typically) of bigger rotors is more thermal mass, and the issues with stopping distances (given most modern brake systems can easily lock the brakes, and therefore stopping distances tend to depend on the road surface, the tires, the cycle time of the antilock system, etc.) are typically then temperature dependent, I would think rotor temps could be an important data point.]

Back on subject--I totally appreciate why you aren't providing pads. But have you considered compiling a list of factory versus "performance" aftermarket pads that fit the calipers?
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Old 06-26-2013, 07:55 AM   #15
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Matador, we have these specifically made for us so I am not sure if there is a comparable stock rotor. Besides the stainless lines you suggested maybe also slap on some aggressive pads too.
What pads would you suggest? also would you be willing to offer a package deal that includes pads, considering that most people doing this upgrade would be doing it when they need to changes their brakes?
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Old 06-26-2013, 08:06 AM   #16
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And following up on Matador's first question, will the "Rotor only" option be availible in the future, for people that already have the kit but need to swap out rotors due to wear/warpage?
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Old 06-26-2013, 08:20 AM   #17
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What pads would you suggest? also would you be willing to offer a package deal that includes pads, considering that most people doing this upgrade would be doing it when they need to changes their brakes?
I like the idea of including pads for a package deal
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Old 06-26-2013, 08:28 AM   #18
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I fail to understand how these will give you better braking performance if you maintain the factory brake pad. You're not increasing the total area of the braking surface or changing the material used to create friction. If anything, with these rotors you're increasing the rotational mass and decreasing the braking surface by cutting vents into it, thereby decreasing your braking performance because you're creating a larger load. Can someone explain the physics here in case I'm missing something?
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Old 06-26-2013, 08:31 AM   #19
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I fail to understand how these will give you better braking performance if you maintain the factory brake pad. You're not increasing the total area of the braking surface or changing the material used to create friction. If anything, with these rotors you're increasing the rotational mass and decreasing the braking surface by cutting vents into it. Can someone explain the physics here in case I'm missing something?
By moving the braking area further from the center you obtain great braking leverage. At least that's my understanding of how it works.
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Old 06-26-2013, 08:40 AM   #20
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By moving the braking area further from the center you obtain great braking leverage. At least that's my understanding of how it works.
In the video, Dennis demonstrated how his socket wrench gave him more torque when he extended it. If you pull the brake pads out further towards the edge of the pad, there would be more rotational torque. The outside of your brake rotor is actually moving faster than the inside. You're now creating more work and increasing the load on the factory brake pad.
The whole idea behind replacing your brakes is to increase the mass, braking area and friction. A larger rotor with the exact same pad will do nothing. Look at a race car. They don't just change out the rotor. The entire system is replaced. Every component of the system must be replaced to affect a change in performance.
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Old 06-26-2013, 08:49 AM   #21
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I see 33-35" tires. Does this mean issues with 37s?
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Old 06-26-2013, 09:08 AM   #22
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Originally Posted by Scott2373 View Post
In the video, Dennis demonstrated how his socket wrench gave him more torque when he extended it. If you pull the brake pads out further towards the edge of the pad, there would be more rotational torque. The outside of your brake rotor is actually moving faster than the inside. You're now creating more work and increasing the load on the factory brake pad.
The whole idea behind replacing your brakes is to increase the mass, braking area and friction. A larger rotor with the exact same pad will do nothing. Look at a race car. They don't just change out the rotor. The entire system is replaced. Every component of the system must be replaced to affect a change in performance.
Sorry. I missed the part about factory pads.
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Old 06-26-2013, 09:20 AM   #23
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The clamping forces required to slow or stop the jeep are lessened with a rotor that is larger in diameter. Simply it takes less clamping force to achieve the same breaking as you move the that breaking area outward from the center of the rotor. Granted, u could do even better with a larger caliper so that you could spread out the breaking area as well. You also benefit from increased heat dissipation with a larger rotor, and less heat generation in general since the break pad and caliper is not working as hard.

The increase in rotational mass and non rotational mass may play a very small role requiring extra breaking forces. It is definitely minute with the rotational mass since it is so close to center. Clearly moving the breaking arm further out will really increase efficiency of breaking.
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Old 06-26-2013, 09:27 AM   #24
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The clamping forces required to slow or stop the jeep are lessened with a rotor that is larger in diameter. Simply it takes less clamping force to achieve the same breaking as you move the that breaking area outward from the center of the rotor. Granted, u could do even better with a larger caliper so that you could spread out the breaking area as well. You also benefit from increased heat dissipation with a larger rotor, and less heat generation in general since the break pad and caliper is not working as hard.

The increase in rotational mass and non rotational mass may play a very small role requiring extra breaking forces. It is definitely minute with the rotational mass since it is so close to center. Clearly moving the breaking arm further out will really increase efficiency of breaking.
Nice summary.
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Old 06-26-2013, 09:38 AM   #25
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In the video, Dennis demonstrated how his socket wrench gave him more torque when he extended it. If you pull the brake pads out further towards the edge of the pad, there would be more rotational torque. The outside of your brake rotor is actually moving faster than the inside. You're now creating more work and increasing the load on the factory brake pad.
The whole idea behind replacing your brakes is to increase the mass, braking area and friction. A larger rotor with the exact same pad will do nothing. Look at a race car. They don't just change out the rotor. The entire system is replaced. Every component of the system must be replaced to affect a change in performance.
I disagree that every component must be changed. I can put aftermarket race pads on my track cars, with no other change (*other than perhaps hi temp brake fluid)--so same rotors, same calipers and the performance changes significantly. A magazine did a test a while back on with identical BMW's. In that case, they replaced the calipers (bigger), rotors (bigger), and pads (tried to get roughly the same MOT and performance capability). Braking distances did not change (in fact, the lengthened a bit with the big brakes). What they did find was that resistance to fade (on the track) was much better with the big brake system.

Since I would imagine no one is tracking their Wranglers, I would think the advantage to an upgrade brake system would be towing (especially near or above the Wrangler's towing limit). I can't think of many off road situations that challenge the brake system to any significant degree (though I'm a noob at this so I may be very wrong).

I do think, though, that the larger rotor opens the door to a more aggressive pad (which, through an increased coefficient of friction with the rotor, will put more heat into it) and that larger rotor should deal with that heat better.
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Old 06-26-2013, 09:38 AM   #26
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I also forgot to add that using these with 35s or even 37s, u have to remember that the rotor and wheels speed is reduced at any given speed compared to stock. A larger rotor will give you back some feel that may have been lost with a larger tire and same size rotor.

Either way. Sounds like the teraflex system is good economical system. Sure you could probably slap on a full system. But that will cost an arm and leg. This setup allows you to upgrade your brakes without any extensive labor. Obviously the durability of the system is unknown. But I doubt teraflex would engineer something that they haven't fully vetted themselves.

And to be honest. No way to really know how this feels and works without some actual differences in stopping distances being shown.
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Old 06-26-2013, 10:26 AM   #27
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We always allow our customers to order individual parts from us, so that means you can get the rotors, these are the same rotors that we use with our big brake kits (you know the one that has the new calipers).
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Old 06-26-2013, 10:30 AM   #28
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If I keep buying TF stuff I'm gonna end up with a sponsorship. LOL
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Old 06-26-2013, 11:35 AM   #29
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We always allow our customers to order individual parts from us, so that means you can get the rotors, these are the same rotors that we use with our big brake kits (you know the one that has the new calipers).

What about a nice package deal with pads?
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Old 06-26-2013, 12:47 PM   #30
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Will the calipers you offer in your big brake kit rub JK's with 16" wheels? I am interested in your kit in a month or so as my brakes need to be done soon.

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