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Old 09-04-2019, 10:31 PM
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To those with Big Brakes

I have 37s with stock brakes. 2018 JK 2-door.
What kit did you choose and why? I don't want to cheap out on this.

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Old 09-04-2019, 11:50 PM   #2
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I got the Crown Auto RT31046 front big brake kit. Uses Ram truck 1 ton calipers. Been very satisfied with the braking.
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Old 09-05-2019, 01:53 AM   #3
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I went with the Teraflex big rotor kit, and it's been great. It beefs up the pads and rotors but leaves the stock hydraulics. It made it an easy kit to install and it made a decent difference. Highly recommend.
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Old 09-05-2019, 02:51 AM   #4
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I went with the MOPAR BBK up front and the Teraflex kit on the rear.
MOPAR BBK: bigger booster, master cyl, discs & dual piston calipers up front
Teraflex: bigger discs but same OEM calipers & pads


I pull a mil-surplus trailer.
I like the added braking power over the stock setup.
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Old 09-05-2019, 04:44 AM   #5
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I got the Dynatrac big brake (rotors) kit because I wanted to improve both the front and rear, since the rear wears out so much quicker. And I didn't want to have to mess with the master cylinder or bleeding them.

Bedded them per instructions and they work awesome, stops very quick now. I can lock them up really easily if I want to. After putting in the Rubi t case it was nearly impossible to stop when going downhill in 4 low, but no problems now. I also pull and 2700 lb camper (dry weight) and didn't even notice when the trailer brakes went out on me once. For the record I'm on 37s with 4.56 gears.

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Old 09-05-2019, 06:03 AM   #6
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I also went with the Dynatrac kit. It is working great so far.
The main advantage to big brake kits is in the larger diameter rotors. That moves the contact point of the brake pads further out from the center of rotation, which increases the leverage the brakes have on stopping the rotor (and you). A second aspect is the larger diameter rotor has more mass and as such takes more heat to raise the temp of the rotor a given amount.
Kits that replace the calipers and / or master cylinders can offer a small amount more in braking improvement, but they can also change the feel of the brakes (not always for the better). Plus they are more expensive and more work to install.
I was torn between the TeraFlex kit(s) and the Dynatrac kit. I like that the Dynatrac kit is a one complete kit deal. And the quality of the kit seems top notch. I'm sure there are other good options, but I had no need for a kit that replaced the calipers (the stock calipers work fine) unless I was going to step up to an opposed piston caliper set up. And for that the price tag is way high. And putting all that work and money into a new caliper that is still a single sided caliper did not seem worth it to me. Running 37's really demanded better brakes. The Dynatrac kit resolved that issue for me.
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Old 09-05-2019, 06:33 AM   #7
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I have the Teraflex front big brake kit with slotted rotors. Stopping is great. On warm days I do get a vibration coming from them, I was told it’s because of the slotted rotors. Drives me nuts? Lol
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Old 09-05-2019, 07:17 AM   #8
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Originally Posted by GlockDude View Post
I got the Crown Auto RT31046 front big brake kit. Uses Ram truck 1 ton calipers. Been very satisfied with the braking.
Same along with the upgraded brake master cylinder and I did the teraflex rear big brake kit when I swapped in my rear CRD60 axle. Night and day difference over factory brakes.
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Old 09-05-2019, 08:25 AM   #9
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I added the Teraflex larger rotors and caliper relocation brackets to the front after I went to 35's. Braking seems to be about the same as the stock setup with 32's, which is much better than the stock rotors with the 35's, so I do not have any plans to add a different master cylinder or calipers, or do anything to the rears.

Only speculation, but IMO 37's would probably be better off with the larger rotors paired with the Ram 1 ton calipers.
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Old 09-05-2019, 10:32 AM   #10
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The Dynatrac kit is awesome. Running 37's the stock brakes were pretty horrible, put the Dynatrac in after reading a lot of reviews and I am super impressed by how easy the install was and how well they stop. Way better than stock on stock wheels.
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Old 09-05-2019, 02:39 PM   #11
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Crown RT31046 kit, Mopar Performance master cylinder and brake booster.

One of the best upgrades I have done.

I run KM3 37x12.5/R17's.
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Old 09-05-2019, 03:56 PM   #12
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You don't need a kit with a booster....I put the dynatrac on mine and love it.....you won't be disappointed....
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Old 09-05-2019, 04:00 PM   #13
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I added the Teraflex larger rotors and caliper relocation brackets to the front after I went to 35's. Braking seems to be about the same as the stock setup with 32's, which is much better than the stock rotors with the 35's, so I do not have any plans to add a different master cylinder or calipers, or do anything to the rears.

Only speculation, but IMO 37's would probably be better off with the larger rotors paired with the Ram 1 ton calipers.
No need for different calipers....have you seen the size of those? And the rear brakes on bbk's are larger than the fronts so you should consider it since wranglers use ALOT of rear braking....
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Old 09-05-2019, 04:12 PM   #14
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You don't need a kit with a booster....I put the dynatrac on mine and love it.....you won't be disappointed....
Well, you may not think you need a larger booster, however, from my experience, on something 12 or older, you absolutely do.

I heard but cannot confirm that the 16+ have a larger booster, in that case, you won't need that part of the upgrade.

I ran both ways with the larger calipers, there is a noticeable difference in the ability to apply the brakes and the pedal feel.
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Old 09-05-2019, 04:16 PM   #15
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Well, you may not think you need a larger booster, however, from my experience, on something 12 or older, you absolutely do.

I heard but cannot confirm that the 16+ have a larger booster, in that case, you won't need that part of the upgrade.

I ran both ways with the larger calipers, there is a noticeable difference in the ability to apply the brakes and the pedal feel.
You are correct.....the 16+ do have the larger booster already....since he has an 18 that's why I said that....
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Old 09-05-2019, 04:21 PM   #16
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Well, you may not think you need a larger booster, however, from my experience, on something 12 or older, you absolutely do.


I ran both ways with the larger calipers, there is a noticeable difference in the ability to apply the brakes and the pedal feel.
You're saying this pertaining to the experience of only upgrading front rotors though, not both front and rear, right?

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Old 09-05-2019, 04:24 PM   #17
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I went with the Teraflex kit because at the time, that was really the only off the shelf kit available. Larger rotor in front, larger caliper, upgraded master cylinder. In the back, larger rotor and a caliper bracket to move the stock caliper out. It’s worked well for me for probably 6 or so years now.

If I were to make the mod today, I’d probably go with the Dynatrac kit because it’s cheaper and simpler. It uses the stock calipers and so doesn’t require any bleeding or changes to the master cylinder. You can also use stock pads once the Dynatrac pads wear out.

In any case, certainly for 37s, or even a JKU on 35s, I’d definitely recommend some kind of big brake kit.
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Old 09-06-2019, 10:27 AM   #18
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You're saying this pertaining to the experience of only upgrading front rotors though, not both front and rear, right?

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Right. As far as larger brakes, I only did the fronts using the Crown kit. The rears, I used a decent set of Powerstop semi ceramic pads on the stock rotors.

I have absolutely no problems stopping 37's while pulling a popup camper with this setup.
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Old 09-10-2019, 06:21 PM   #19
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Quote:
Originally Posted by IndyRubicon17 View Post
You don't need a kit with a booster....I put the dynatrac on mine and love it.....you won't be disappointed....
Well, you may not think you need a larger booster, however, from my experience, on something 12 or older, you absolutely do.

I heard but cannot confirm that the 16+ have a larger booster, in that case, you won't need that part of the upgrade.

I ran both ways with the larger calipers, there is a noticeable difference in the ability to apply the brakes and the pedal feel.
I have a 2015 and no need for a booster with my dynatracs. On 37’s and brakes are like glue.
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Old 09-10-2019, 06:58 PM   #20
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I also got the Dynatrac system for the ease of installation and no messing around with the bleeding etc. I’m running mine on 33” with plans of lift and possibly bigger tires in the near future. What a difference in the braking! Stops on a dime! Took it on recent road trip loaded down with roof rack and a huge Akita (our road dog) and it performed like a champ. Very happy with this system.
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Old 09-10-2019, 07:29 PM   #21
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Thanks to everyone for this potentially lifesaving thread. Better brakes is something I desperately need. I'm running 35 M/Ts on my 2014 Wrangler. On the skid pad, mine currently stops from 70 mph to 0 in about 2 hours. Maybe three if the wind is at my back. Scary!
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Old 09-10-2019, 07:47 PM   #22
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One more for the Dynatrac kit. I would have done the Mopar kit but I have a compressor in the engine bay so no room for the larger master cylinder/booster.

As others said, the Dynatrac kit is awesome and itís a bit easier to install than the Mopar but, really, I havenít heard anything bad about Teraflex or Crown so it sure you can go wrong.


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Old 09-10-2019, 09:37 PM   #23
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Dynatrac ProGRIP System

Easy install and good stopping power for my 37s on Beadlock KMC Machete Crawlers installed. Great value.
Original pads wear out quickly though, about 10k miles.
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Old 09-10-2019, 10:53 PM   #24
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As others said, the Dynatrac kit is awesome and itís a bit easier to install than the Mopar but, really, I havenít heard anything bad about Teraflex or Crown so it sure you can go wrong

A few questions for those who have installed Dynatrac:

1. Did you install fronts only or front and back?
2. Does the Dynatrac kit use OEM pads or special pads you need to source from Dynatrac?
3. How long do the pads last?
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Old 09-11-2019, 06:54 AM   #25
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A few questions for those who have installed Dynatrac:

1. Did you install fronts only or front and back?
2. Does the Dynatrac kit use OEM pads or special pads you need to source from Dynatrac?
3. How long do the pads last?
I have both the front and rear for Dynatrac, that is how they sell the kit. But I am waiting on the rear axle shafts before doing the rears, no point taking it that far apart and doing it again in a few weeks to install the axle shafts. The fronts have been done and so far so good.
The Dynatrac kit comes with pads, but since it uses the stock calipers you could use stock pads or any pads that fit the stock set up. That is one nice thing about not going with a kit that replaces the calipers, it still uses the stock style pads. The Dynatrac pads seem to work great, but it is too soon for me to judge how long they will last.
I am curious to see if they (Dynatrac) will sell their rotors and pads without the brackets, as I prefer to replace rotors with pads. I know you can have rotors turned, but that removes material and reduces their ability to perform.
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Old 09-11-2019, 08:13 AM   #26
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Last night I ordered the Dynatrac ProGrip Brake Upgrade System. There have been several times on the freeway I've had to swerve out of my lane to avoid hitting someone who stopped faster than I could stop. Not good. Not good at all. Really looking forward to this upgrade. I chose Dynatrac because they have a strong reputation for quality, confident reviews, great price, easy installation, and several installation videos. So all things considered, I went with them. Thanks to all.
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Old 09-11-2019, 08:55 AM   #27
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Before I went with my BBK, the best thing I did was change stock rear pads, which had worn out, with Hawk LTS pads. Amazing stopping and feeling with just that small change.
Still not what I fully wanted, so I went with Teraflex front (only) BBK. Again, much better, and together with rear Hawk pads, made braking good. However, I was still not happy with the pedal "mush".
Last, I got the J8 master/booster, and changed front pads to Hawk LTS, as well.
Solid pedal, intense braking, no doubt brakes are being applied. Significantly better than any other JK (or JL for that matter) than I've driven. Was going to get rear Teraflex BBK, but decided to hold off, for now, as I don't see any immediate need.
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Old 09-11-2019, 07:56 PM   #28
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Where are you guys getting the Dynatrac kit from and how much does a kit run?
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Old 09-11-2019, 08:19 PM   #29
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A few questions for those who have installed Dynatrac:

1. Did you install fronts only or front and back?
2. Does the Dynatrac kit use OEM pads or special pads you need to source from Dynatrac?
3. How long do the pads last?
I can answer 1 only, which is back only. Mopar big brake kit in the front. Just installed and waiting to get aligned (Metalcloak lift went on at the same time), so no impressions yet.
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Old 09-12-2019, 06:26 AM   #30
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Where are you guys getting the Dynatrac kit from and how much does a kit run?
As far as I know, the Dynatrac kit come in two flavors, rear only and front and rear.
The rear only kit is just over $600 and the front and rear kit is just over $1,000.
I think I bought mine from Quadratec. But Northridge is another possibility. Both will give you a discount on the price for being a forum member. (with NR 4x4 try putting wranglerforum in the coupon field in your cart, I wish Quadratec had it so simple)
Another option is a small independent shop like AOR (Allens Off Road) or KOR (Krawl Off Road). Both of them are good folks to deal with and both of them also will typically give you a discount for being a forum member. Lately I have bought a few things from Jason and Austin @KOR. In part because I like supporting the independent shops, but also because they gave me a great price and they are located in the same side of the country I am on. I would happily buy from Allen, but he is on the other side of the country from me. I guess in the end that probably doesn't matter, but sometimes it does.
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