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wj front calepers onto 1990 xj

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Old 05-31-2015, 11:28 PM
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Default wj front calepers onto 1990 xj

will the front calapers from a 99 wj (the doule piston ones ) fit directly into the calaper mounts on my 90 xj ? or do i have to change to on mounts from the 99wj ? i wont to put bigger braking without changing the mounts . could you give me the years that will work . also are there front calapers that will fit the rear mounts from a wj 95 ? thanks
Old 06-01-2015, 07:21 AM
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You have to change the steering knuckles but it takes a lot of work to use them,Like a over the axle track bar and change your whole steering system since the wj is way different then a xj.
Old 06-01-2015, 08:16 AM
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Originally Posted by cj boyce
will the front calapers from a 99 wj (the doule piston ones ) fit directly into the calaper mounts on my 90 xj ? or do i have to change to on mounts from the 99wj ? i wont to put bigger braking without changing the mounts . could you give me the years that will work . also are there front calapers that will fit the rear mounts from a wj 95 ? thanks
Before getting into all that, have you considered doing the WJ booster swap?
Old 06-01-2015, 09:55 AM
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Originally Posted by cruiser54
Before getting into all that, have you considered doing the WJ booster swap?
with a 90XJ, wonder if he even did a 96+ upgrade to dual diaphragm.
Old 06-01-2015, 07:00 PM
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Originally Posted by sycoglitch
with a 90XJ, wonder if he even did a 96+ upgrade to dual diaphragm.
It's 95/96 actually.

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…..
Old 06-01-2015, 07:05 PM
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Originally Posted by cruiser54
It's 95/96 actually. 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…..
This info should be stickied and thanks for the detailed clarification
Old 06-01-2015, 07:09 PM
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Originally Posted by sycoglitch
This info should be stickied and thanks for the detailed clarification
Pics for WJ conversion.
Attached Thumbnails wj front calepers onto 1990 xj-booster-clearance-wj.jpg   wj front calepers onto 1990 xj-booster-clearance.jpg   wj front calepers onto 1990 xj-booster-firewall.jpg   wj front calepers onto 1990 xj-booster-rod-mod.jpg  
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Old 06-01-2015, 09:28 PM
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Originally Posted by cruiser54
Pics for WJ conversion.
excellent! Did u ever do a write up for this?
Old 06-01-2015, 09:34 PM
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Originally Posted by XJwonders
excellent! Did u ever do a write up for this?
No. I might when I do my son-in-law's 87. It will be WJ.
Old 06-01-2015, 09:40 PM
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Originally Posted by cruiser54
No. I might when I do my son-in-law's 87. It will be WJ.
will be looking forward to it
Old 06-01-2015, 09:44 PM
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Originally Posted by XJwonders
will be looking forward to it
But you've got a 99.....

It only applies up through 94.
Old 06-01-2015, 09:46 PM
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Originally Posted by cruiser54
But you've got a 99..... It only applies up through 94.
what, who said anything about doing it on my jeeps? Lol. I'm just looking forward to the information so that I can pass it along to those who need it. And who knows, when I ever get an older jeep, I'll know what to do.
Old 06-01-2015, 09:49 PM
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Originally Posted by XJwonders
what, who said anything about doing it on my jeeps? Lol. I'm just looking forward to the information so that I can pass it along to those who need it. And who knows, when I ever get an older jeep, I'll know what to do.
You'll get some side job by telling someone you know a little known trick for increasing their stopping power and then do it for them.......Mikey needs the mod.....
Old 06-01-2015, 09:53 PM
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Originally Posted by cruiser54
You'll get some side job by telling someone you know a little known trick for increasing their stopping power and then do it for them.......Mikey needs the mod.....
haha I try to avoid brake jobs because I hate bleeding the lines.

Mikey's jeep is a 99 also. Haha
Old 06-01-2015, 09:54 PM
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Originally Posted by XJwonders
haha I try to avoid brake jobs because I hate bleeding the lines.

Mikey's jeep is a 99 also. Haha
Don't have a mighty vac?


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