WJ brake knuckle conversion on 99 XJ poss. - Page 2 - JeepForum.com

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post #16 of 20 Old 07-01-2013, 12:06 AM
Hudson
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1999 XJ Cherokee 
 
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Question.

Haven't seen mention of the master cylinder.

When you start running WJ front brakes and ZJ rear disc brakes do you need a different master cylinder (like the WJ), or does the XJ one work fine?

Oh, and my last question. How do you buy rotors? Do you just buy WJ rotors and then have them drilled out to the XJ bolt pattern or are they already the same?


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Build Thread - http://www.ausjeepoffroad.com/forum/showthread.php?t=121903
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post #17 of 20 Old 07-01-2013, 01:03 AM
Timo_90xj
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I'm running the stock MC on my ZJ, no issues. Some people swap in WJ master cylinder, it requires you to fab a 1/4" spacer for the firewall (which I believe is a non-issue to you ).

WJ rotors are different from XJ/ZJ/TJ, drill the rotors to accept 5 x 4.5. I used a drill press and an old unit hub spindle (with the spindle cut off/ studs whacked out) as guide.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

http://www.jeepforum.com/forum/f13/d...s-etc-1222317/


1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #18 of 20 Old 07-14-2013, 10:21 PM
thechefinman
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Man that was one hell of a write up!

Quote:
Originally Posted by 1990JEEPXJ View Post
JKS sells the necessary hub spacer just for this swap

heres the simplest write up

XJ Buildup III - Page 9 - NAXJA Forums -::- North American XJ Association
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post #19 of 20 Old 07-14-2013, 10:46 PM
thechefinman
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I have a question about this build... I am new to the jeep world and love mine very much. I want to do this build because of the extra stopping power that it would get and there is a killer deal that I came across for 99-02 oem still in the box calipers. I have read both threads only to find that both individuals used spacers and re-drilled wj rotors (which I am fine with doing). I think my main confusion is where or when they start talking about the spacers. Is there aftermarket spacers that you can buy? Is there a more proper fitting hub (in actuality what hub needs to be used) that a person can use or does that hub have to be milled? If this mod comes down to milling that's gonna have to be a bust for me unfortunately. Also does this mod require a minimum rim size. I think I read that somewhere I just cant remember where.
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post #20 of 20 Old 07-15-2013, 12:04 AM
Timo_90xj
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JKS makes the 1/4" weld-on hub spacer, it's been mentioned on this thread as well. About 15 bucks a piece or so. You can use stock XJ unit hubs on the WJ knuckles, no machining required. That's why you're buying the 1/4" hub spacer (aligns u-joints in relation to balljoints).

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

http://www.jeepforum.com/forum/f13/d...s-etc-1222317/


1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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