Need an upgraded master cylinder for Dynatracs Big Brake package - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 27 Old 11-27-2013, 01:21 PM Thread Starter
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Need an upgraded master cylinder for Dynatracs Big Brake package

Does anybody have any suggestions for a master cylinder upgrade for a JKU with Dynatracs Big Brake Package? The front 60 has a 14.5" rotor from a Ford F450/550 and an (as I recall) E350 Dual Piston Caliper. The rear PR80 has the 13.9 J8 brakes.

The only readily available option I am aware of is the Teraflex master cylinder upgrade. Is that enough? I was thinking there might be an upgrade from a Dodge pickup that could be done too.

The ProRock 60 front and ProRock 80 read shipped today and are going to arrive next Tuesday. It will be nice to be able to get into the 6.2 without worrying about my axles holding up.

08 JKU Rubi, GM 6.2 LS, 6L80 6 sp automatic, Atlas 4 sp TC, Dynatrac ProRock 80 rear and in front PR60 w RCV shafts, DynaLock w Stub hubs, 4.88 gears and ARB Lockers, 4.0" lift, Synergy Long Arm, King coilovers, 40" Nitto's, Hutchison Rock Monster wheels, GenRight alum bumper and fenders, GenRight 20 gal aux gas tank, PSC steering, Warn Zeon 12K.

2nd Jeep is a 2014 Grand Cherokee Overland with a 5.7 Hemi, Quadra-Lift Suspension and Quadra-Drive II. My wife says I can't do anything to it!
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post #2 of 27 Old 11-27-2013, 02:37 PM
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I have the oem master in my JK with the d60 front (non big brake) and d80 with JK8 brakes and 40's and it stops just fine. Maybe 10% more pedal effort, but it will easily stop the jeep with the ABS hammering away.

Try it with your stock master. If you don't like it, easy fix.
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post #3 of 27 Old 11-27-2013, 04:14 PM Thread Starter
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I wasn't sure if the brakes would work at all with upgraded brakes. I'm glad to here it is working for you. I wonder what caliper Dynatrac uses on the std brake package? I spoke to the folks at EVO, who did the JP magazine RESQ1, which has the Big Brake Package and the guy I spoke to said that he thought it had the standard master cylinder. So maybe I'll give it a try with the stock unit.

On the other hand I was planning on having Jeep do their STAR ABS bleeding after the install. I did it after I replaced my brake lines and it made a difference over my careful bleeding. As it's 89 bucks and the TF master is 194 I might just do it so I only have to bleed once.

08 JKU Rubi, GM 6.2 LS, 6L80 6 sp automatic, Atlas 4 sp TC, Dynatrac ProRock 80 rear and in front PR60 w RCV shafts, DynaLock w Stub hubs, 4.88 gears and ARB Lockers, 4.0" lift, Synergy Long Arm, King coilovers, 40" Nitto's, Hutchison Rock Monster wheels, GenRight alum bumper and fenders, GenRight 20 gal aux gas tank, PSC steering, Warn Zeon 12K.

2nd Jeep is a 2014 Grand Cherokee Overland with a 5.7 Hemi, Quadra-Lift Suspension and Quadra-Drive II. My wife says I can't do anything to it!
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post #4 of 27 Old 11-27-2013, 04:44 PM
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Look up P/N 130.63070. It's the HD version MC used in the J8. I believe it is the same MC branded as the Teraflex because it gives the same % volume increase. Go to Centric brakes' website. The have all the specs on bore and stroke on just about all OEM MC's. I'm putting SSBC 8 pistons on my RJIII and 2500HD calipers on my 14b in the next few weeks and that is the MC I'm thinking about running.
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post #5 of 27 Old 11-27-2013, 06:09 PM
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I am running pro rock 60's with those exact brakes and they are fine with the factory mc, actually much better stopping then the factory and stock wheels.

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post #6 of 27 Old 11-27-2013, 07:06 PM
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Quote:
Originally Posted by thedirtman View Post
I am running pro rock 60's with those exact brakes and they are fine with the factory mc, actually much better stopping then the factory and stock wheels.
What size wheel do you have to run with those?

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post #7 of 27 Old 11-27-2013, 07:26 PM
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40" mtr's

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post #8 of 27 Old 11-27-2013, 07:28 PM
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Someday we might bump into each other. I am curious to see your rig.

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post #9 of 27 Old 11-27-2013, 07:53 PM
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I think he was asking what rim size.

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post #10 of 27 Old 11-27-2013, 08:26 PM
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I run a 17" wheel. It is the min with those brakes.

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post #11 of 27 Old 11-27-2013, 08:38 PM Thread Starter
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Dynatracs literature says 17 wheels or larger are required. They told me that they have not yet encountered a 17" wheel they would not work with. When I told them I was planning on running Hutchison Rock Monster Dual headlocks they said they did not know if they would work due to the two piece nature of the rim. My axles were delayed until Hutchison got a new batch of the wheels made. I had them send one of the wheel to Dynatrac to test fit before I gave the final go ahead on the Big Brake Package. They test fit the wheel and found the caliper cleared but only by the thickness of a few business cards.

So it should be safe to say my wheels are the worst case scenario and they should fit any 17" wheel.

I am really looking forward to having these brakes in the mountains of Colorado. There has been more than one time when I thought I was running out of brake.

08 JKU Rubi, GM 6.2 LS, 6L80 6 sp automatic, Atlas 4 sp TC, Dynatrac ProRock 80 rear and in front PR60 w RCV shafts, DynaLock w Stub hubs, 4.88 gears and ARB Lockers, 4.0" lift, Synergy Long Arm, King coilovers, 40" Nitto's, Hutchison Rock Monster wheels, GenRight alum bumper and fenders, GenRight 20 gal aux gas tank, PSC steering, Warn Zeon 12K.

2nd Jeep is a 2014 Grand Cherokee Overland with a 5.7 Hemi, Quadra-Lift Suspension and Quadra-Drive II. My wife says I can't do anything to it!
post #12 of 27 Old 11-27-2013, 08:40 PM Thread Starter
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Quote:
Originally Posted by PyratM View Post
Look up P/N 130.63070. It's the HD version MC used in the J8. I believe it is the same MC branded as the Teraflex because it gives the same % volume increase. Go to Centric brakes' website. The have all the specs on bore and stroke on just about all OEM MC's. I'm putting SSBC 8 pistons on my RJIII and 2500HD calipers on my 14b in the next few weeks and that is the MC I'm thinking about running.
I looked up this part number and it is the MC for a Dodge Nitro. What they hell is Jeep thinking, putting a smaller MC on a 4 dr Wrangler than on a Nitro?

08 JKU Rubi, GM 6.2 LS, 6L80 6 sp automatic, Atlas 4 sp TC, Dynatrac ProRock 80 rear and in front PR60 w RCV shafts, DynaLock w Stub hubs, 4.88 gears and ARB Lockers, 4.0" lift, Synergy Long Arm, King coilovers, 40" Nitto's, Hutchison Rock Monster wheels, GenRight alum bumper and fenders, GenRight 20 gal aux gas tank, PSC steering, Warn Zeon 12K.

2nd Jeep is a 2014 Grand Cherokee Overland with a 5.7 Hemi, Quadra-Lift Suspension and Quadra-Drive II. My wife says I can't do anything to it!
post #13 of 27 Old 11-27-2013, 08:49 PM
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I am running the 8 lug Rock Monster Wheels.

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Last edited by thedirtman; 12-29-2016 at 10:11 AM.
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post #14 of 27 Old 11-27-2013, 09:23 PM Thread Starter
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Originally Posted by thedirtman View Post
I am running the 8 lug Rock Monster Wheels.
Is that the J8 brake with the 13.9 rotor on the rear? Clearance was a bit more of an concern in the front with its 14.5" rotor. It is going to be a hell of a step up from the factory 12" single piston setup. The JKU should have had Dodge 3/4 ton size brakes from the factory.

08 JKU Rubi, GM 6.2 LS, 6L80 6 sp automatic, Atlas 4 sp TC, Dynatrac ProRock 80 rear and in front PR60 w RCV shafts, DynaLock w Stub hubs, 4.88 gears and ARB Lockers, 4.0" lift, Synergy Long Arm, King coilovers, 40" Nitto's, Hutchison Rock Monster wheels, GenRight alum bumper and fenders, GenRight 20 gal aux gas tank, PSC steering, Warn Zeon 12K.

2nd Jeep is a 2014 Grand Cherokee Overland with a 5.7 Hemi, Quadra-Lift Suspension and Quadra-Drive II. My wife says I can't do anything to it!
post #15 of 27 Old 11-27-2013, 09:44 PM
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Yes that is the rear. Here is the front. I am running 1.5" spacers with them. There is roughly 3/4" of an inch of space between the wheel and the caliper. Not a great angle on the photo.

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Last edited by thedirtman; 12-29-2016 at 10:16 AM.
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post #16 of 27 Old 11-27-2013, 09:58 PM
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Did they give you the part numbers for the new parking brake cable you are going to need?

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post #17 of 27 Old 11-27-2013, 10:37 PM Thread Starter
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Quote:
Originally Posted by thedirtman View Post
Yes that is the rear. Here is the front. I am running 1.5" spacers with them.
Yeah, that is a bit on the tight side. The backspacing on my Rock Monsters is 4.5" and they say it will work with no problems. They put the wheel on the axle with the brakes. I sure don't want to run spacers; I'm already concerned about the 2.5" wider I'm going to be with these axles.

Did you say that you were running the stock master cylinder?

08 JKU Rubi, GM 6.2 LS, 6L80 6 sp automatic, Atlas 4 sp TC, Dynatrac ProRock 80 rear and in front PR60 w RCV shafts, DynaLock w Stub hubs, 4.88 gears and ARB Lockers, 4.0" lift, Synergy Long Arm, King coilovers, 40" Nitto's, Hutchison Rock Monster wheels, GenRight alum bumper and fenders, GenRight 20 gal aux gas tank, PSC steering, Warn Zeon 12K.

2nd Jeep is a 2014 Grand Cherokee Overland with a 5.7 Hemi, Quadra-Lift Suspension and Quadra-Drive II. My wife says I can't do anything to it!
post #18 of 27 Old 11-27-2013, 10:39 PM Thread Starter
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Originally Posted by thedirtman View Post
Did they give you the part numbers for the new parking brake cable you are going to need?
They said the stock cable could be reused but would need to be rerouted. hey might have mentioned supplying an adaptor to use at the end of the existing cable.

08 JKU Rubi, GM 6.2 LS, 6L80 6 sp automatic, Atlas 4 sp TC, Dynatrac ProRock 80 rear and in front PR60 w RCV shafts, DynaLock w Stub hubs, 4.88 gears and ARB Lockers, 4.0" lift, Synergy Long Arm, King coilovers, 40" Nitto's, Hutchison Rock Monster wheels, GenRight alum bumper and fenders, GenRight 20 gal aux gas tank, PSC steering, Warn Zeon 12K.

2nd Jeep is a 2014 Grand Cherokee Overland with a 5.7 Hemi, Quadra-Lift Suspension and Quadra-Drive II. My wife says I can't do anything to it!
post #19 of 27 Old 11-27-2013, 10:43 PM
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Yes, I am running the factory master cylinder with dynatrac pro rock 60 front and rear (68.5" wms) with rear JK8 brakes and the 14.5" front ford brakes. I am running the Hutchington rock monster 8x6 17" "dodge" wheel with 4.5" backspacing. 1.5" adapter on the front and 2" on the rear.

As per Dynatrac, You need the parking brake cables for J8 Military rear disc brakes
- Chrysler part #’s
68002669AB
56052970AC

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post #20 of 27 Old 11-27-2013, 10:49 PM Thread Starter
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Quote:
Originally Posted by thedirtman View Post
Yes, I am running the factory master cylinder with dynatrac pro rock 60 front and rear (68.5" wms) with rear JK8 brakes and the 14.5" front ford brakes. I am running the Hutchington rock monster 8x6 17" "dodge" wheel with 4.5" backspacing. 1.5" adapter on the front and 2" on the rear.

As per Dynatrac, You need the parking brake cables for J8 Military rear disc brakes
- Chrysler part #s
68002669AB
56052970AC
Thanks for the info. I guess I will need to buy the cables. Out of curiosity why are you running spacers? Given the additional width of the 60 over stock you must have quite a wide stance.

08 JKU Rubi, GM 6.2 LS, 6L80 6 sp automatic, Atlas 4 sp TC, Dynatrac ProRock 80 rear and in front PR60 w RCV shafts, DynaLock w Stub hubs, 4.88 gears and ARB Lockers, 4.0" lift, Synergy Long Arm, King coilovers, 40" Nitto's, Hutchison Rock Monster wheels, GenRight alum bumper and fenders, GenRight 20 gal aux gas tank, PSC steering, Warn Zeon 12K.

2nd Jeep is a 2014 Grand Cherokee Overland with a 5.7 Hemi, Quadra-Lift Suspension and Quadra-Drive II. My wife says I can't do anything to it!
post #21 of 27 Old 11-27-2013, 10:53 PM
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I am running a 40x13.5" tire, 4" of lift with 14" travel front coil overs and 16" rear travel. 37x12.5 will fit fine without spacers but the 40's rubbed everything without spacers.

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post #22 of 27 Old 11-27-2013, 11:40 PM Thread Starter
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Originally Posted by thedirtman View Post
I am running a 40x13.5" tire, 4" of lift with 14" travel front coil overs and 16" rear travel. 37x12.5 will fit fine without spacers but the 40's rubbed everything without spacers.
Gotcha. I wonder how people with std width 44's manage to run 40's. Is it more lift or do they have to adjust out their steering stops?

08 JKU Rubi, GM 6.2 LS, 6L80 6 sp automatic, Atlas 4 sp TC, Dynatrac ProRock 80 rear and in front PR60 w RCV shafts, DynaLock w Stub hubs, 4.88 gears and ARB Lockers, 4.0" lift, Synergy Long Arm, King coilovers, 40" Nitto's, Hutchison Rock Monster wheels, GenRight alum bumper and fenders, GenRight 20 gal aux gas tank, PSC steering, Warn Zeon 12K.

2nd Jeep is a 2014 Grand Cherokee Overland with a 5.7 Hemi, Quadra-Lift Suspension and Quadra-Drive II. My wife says I can't do anything to it!
post #23 of 27 Old 11-28-2013, 09:23 AM
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3.25" bs wheel & 1.5" spacers will allow you to run 40's on the factory width axle.
Some do 6"+ of lift with lots of bump stop. And some adjust steering stops.

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post #24 of 27 Old 11-28-2013, 09:25 AM
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I used the stock ebrake cables in the back - just had to route them a bit different.

And as a point of reference - I have a 4" lift with saggy old '07 era TF springs and 1" rubber spacers front and back with genright regular fenders front and back. And the 40" MTR's just barely fit full stuff (with generous inner metal trimming on the body). They hit the front control arms at full lock with the Dyna 60 front - and TR 17's.

The outside to outside measurement on the axles/wheels/tires now is 86" - and it wont fit on my 83" wide trailer anymore
It is wider than my unimog axled truggy (though the mog axles are narrowed a bit).

Last edited by BigJk; 11-28-2013 at 09:29 AM.
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post #25 of 27 Old 12-02-2013, 10:46 AM
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Someday we might bump into each other. I am curious to see your rig.
I'm hoping to have mine going soon and i'm sure I'll see you on some runs soon after that. I miss going out on some of the runs Bill does even if they were 2wd stuff

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