Booster Upgrade

[1990JEEPXJ]

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.

[cruiser54]

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…..

[mgracer]

Does one work better than the other?

[Johnnie Walker]

Originally Posted by mgracer

Does one work better than the other?

6 of one, half dozen of another.

[mgracer]

Pushrod issues with either one?

[Green XJ Jeep]

Originally Posted by mgracer

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.

[comanche91]

Originally Posted by cruiser54

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.

[cruiser54]

Originally Posted by mgracer

Does one work better than the other?

The 99 to 2004 wJ works better in my experience.

[mgracer]

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?

[comanche91]

Originally Posted by mgracer

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?

[ehall]

Originally Posted by mgracer

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.

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

[mgracer]

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!

[BenWheelin]

Originally Posted by Green XJ Jeep

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.

[Starboard M]

Originally Posted by mgracer

Spidermikey88, what mods did you have to do?

http://naxja.org/forum/showthread.php?t=983426

[muddypunk]

Originally Posted by spidermikey88

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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