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  #16  
Old October 12th, 2017, 12:06
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1990JEEPXJ 1990JEEPXJ is offline
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Re: Booster Upgrade

All you should have to do is bend and flare some lines. The washer bottle does not need to be moved to fit the WJ booster on a Renix.
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  #17  
Old October 17th, 2017, 06:42
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cruiser54 cruiser54 is offline
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Re: Booster Upgrade

WJ versus 95 to 96 XJ booster

Actually, the WJ booster is in some ways easier than the 95 to 96 XJ.

I've done both.

XJ, you don't have to mess with the firewall. No big deal anyway.
But, you have to move the washer reservoir. And, once the original booster comes out, the bracket inside the cab moves and makes it a bear to install the new booster.

WJ you have to bend or cut the firewall lip, but don't move the washer bottle.
As an added bonus, the mounting studs of the WJ booster are a bit smaller and it's easier to get in.
Another bonus with the WJ is that it has FLEXIBLE lines from the master cylinder that make putting things together MUCH easier.

And, WJ boosters are newer and easier to find…..
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  #18  
Old October 19th, 2017, 10:12
mgracer mgracer is offline
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Re: Booster Upgrade

Does one work better than the other?
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  #19  
Old October 19th, 2017, 14:20
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Re: Booster Upgrade

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Originally Posted by mgracer View Post
Does one work better than the other?
6 of one, half dozen of another.
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  #20  
Old October 19th, 2017, 17:17
mgracer mgracer is offline
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Re: Booster Upgrade

Pushrod issues with either one?
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  #21  
Old October 19th, 2017, 19:10
Green XJ Jeep Green XJ Jeep is offline
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Re: Booster Upgrade

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Originally Posted by mgracer View Post
Pushrod issues with either one?

When I did the WJ on my 89 I had to open the hole up a little bit and grind a flat spot for the brake light switch.
Lots of videos on the swap.
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  #22  
Old October 19th, 2017, 19:48
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Re: Booster Upgrade

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Originally Posted by cruiser54 View Post
WJ versus 95 to 96 XJ booster

Actually, the WJ booster is in some ways easier than the 95 to 96 XJ. I've done both.
Perhaps this is true if you are doing the WJ upgrade on a Renix. But for the 91 and up HOs, the 95/96 XJ swap is by far the easiest. Using the 1/4" spacer behind the booster, no firewall mods are required, and the firewall holes are correct for the four booster mounting studs. It's pure plug and play, even with the brake switch wiring. The only thing that's different are the two brake line fittings on the master cylinder you have to plumb in. And if your windshield washer tank is still in the stock location, it may have to be moved forward a bit if you don't make tight bends on the master cylinder lines. A two hour job max, even with bleeding.

Last edited by comanche91; October 19th, 2017 at 19:58.
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  #23  
Old October 19th, 2017, 22:11
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Re: Booster Upgrade

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Does one work better than the other?
The 99 to 2004 wJ works better in my experience.
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  #24  
Old October 21st, 2017, 22:05
mgracer mgracer is offline
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Re: Booster Upgrade

Got the 96 booster & mc & prop valve in. Should I use the 91 or 96 prop valve? Also, what do I with all the wiring left from the old system? There are plugs everywhere! And my battery went dead. Any relation to unplugging all the old brake stuff?
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  #25  
Old October 21st, 2017, 22:24
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Re: Booster Upgrade

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Originally Posted by mgracer View Post
Also, what do I with all the wiring left from the old system? There are plugs everywhere! And my battery went dead. Any relation to unplugging all the old brake stuff?
What wiring? A 96 booster/master swap on your 91 requires no wiring changes. Did (does) your 91 have ABS?
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  #26  
Old October 22nd, 2017, 08:27
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Re: Booster Upgrade

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Originally Posted by mgracer View Post
Should I use the 91 or 96 prop valve?
I don't think there's any difference between them but I don't know about ABS for certain. They are not different for non-ABS. The flared fittings on the new MC are different and will have to be changed.

Quote:
Also, what do I with all the wiring left from the old system?
Pull the ABS fuses and relays from the PDC box and ignore the wiring
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  #27  
Old October 23rd, 2017, 08:00
mgracer mgracer is offline
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Re: Booster Upgrade

The 91 had ABS. I got the proportioning valve with the 96 mc & booster & left it hooked up. I am just going to hook up the lines to the wheels & try it. Thanks for the help everybody!
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  #28  
Old October 24th, 2017, 09:04
BenWheelin BenWheelin is offline
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Re: Booster Upgrade

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Originally Posted by Green XJ Jeep View Post
The newer ones will have am electric motor back up.
Its been my experience that while the back up does indeed work it doesnt work that well.
Bracking performance is about the same if you stall and have no vacuum going to a vacuum booster
That pedal feel, though.

To each their own.
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  #29  
Old October 26th, 2017, 12:12
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Starboard M Starboard M is offline
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Re: Booster Upgrade

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Originally Posted by mgracer View Post
Spidermikey88, what mods did you have to do?
http://naxja.org/forum/showthread.php?t=983426
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  #30  
Old October 26th, 2017, 17:06
muddypunk muddypunk is offline
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Re: Booster Upgrade

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Originally Posted by spidermikey88 View Post
I did the wj booster and master cylinder upgrade on my 87 and it made a huge difference. But like the other guys have said, you have to do a few modifications to make it work. I think it was worth it though and I'm about to do the same thing to another xj I just picked up.

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What did you do about the prop valve?

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