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Unread 10-15-2011, 07:29 AM   #1
sean2857
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xj rear disc brake upgrade

What parts are needed from a grand cherokee to complete the rear disc brake conversion on an 01 xj? also, what year grand cherokees will work?

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Unread 10-15-2011, 07:32 AM   #2
JHW12084
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96-98 backing plates and calipers and caliper mount.....word of the wise......change you axle seals why you're there. also get ebrake cables for the zj
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Unread 10-15-2011, 07:35 AM   #3
sean2857
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is there a big improvement in braking compared to the drum set-up?
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Unread 10-15-2011, 08:59 AM   #4
whitexj98
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Yes, I noticed a good improvement. I also swapped the proportioning valve off the ZJ. For the parking brake use either side from the Zj for the xj short side and a long side cable from a 97 explorer will fit the long side.
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Unread 10-15-2011, 09:51 AM   #5
AZ Jeff
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Quote:
Originally Posted by sean2857 View Post
is there a big improvement in braking compared to the drum set-up?
Actually, there is fairly little difference in braking performance between the XJ drums and the ZJ discs, but this ONLY applies if you are comparing XJ drums that are working as designed.

MANY owners of XJ's have drum brakes that are out of adjustment and/or have worn or non-functioning parts. These forums are rife with people complaining about this.

If your current drum brakes are not functioning as new, you can expect to see an improvement with the discs. The discs are also easier to maintain than drum brakes, once you install them.
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Unread 01-28-2012, 12:20 AM   #6
BigOrangeXJ
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I am considering doing the crown vic rear disc upgrade for my D44 that will be going in the rear of my '98 XJ. Are the ZJ discs/calipers suppose to be better than the crown vics or any easier of an install?
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Unread 01-28-2012, 12:34 AM   #7
rawk hard xj
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hope I'm not too late, have you gone here? http://www.go.jeep-xj.info/HowtoBArearBrakes1.htm or here http://www.go.jeep-xj.info/HowtoTerritoryRears.htm or here http://www.go.jeep-xj.info/HowtoRearDiscs1.htm Hope this helps. Its been a while since I've seen anyone reference this amazing site.
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Unread 01-28-2012, 05:02 AM   #8
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Here ya go. Be sure to snag the caliper bracket mounting studs and lug studs from the donor GC axle. You're gonna need them.

http://www.jeepforum.com/forum/f11/z...-truth-607435/
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Unread 01-28-2012, 08:04 AM   #9
foggybottombob
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The difference in braking force between rear drums and rear disks is not even noticeable. Unless you have some other reason for swapping to disks don't bother.
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Unread 01-28-2012, 09:03 AM   #10
Mwildmann
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Quote:
Originally Posted by foggybottombob View Post
The difference in braking force between rear drums and rear disks is not even noticeable. Unless you have some other reason for swapping to disks don't bother.
Like was said above, if your drums arent functioning properly, which i have seen a lot on XJs, the disc upgrade will offer greatly improved breaking performance. I noticed a huge improvement in mine and it's one of the best mods i've done so far. And of course there is the much easier maintenance to boot! It's cheap and easy and there just isn't any reason NOT to do it in my opinion.
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Unread 01-28-2012, 10:41 AM   #11
xjman4life
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I did this mod with a 95-98 zj kit. I had to use a e brake cable from a ford explorer on my 01 because the second zj brake cable was too short. I also had to get longer studs from advance to replace the old ones. It was a nice upgrade and only had to modify the backing plate center hole slightly to work. It brakes much more controlled and in a straight line vs pulling to the left or right before because of improperly adjusted rears.
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Unread 01-28-2012, 11:54 AM   #12
alexrule123
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Quote:
Originally Posted by xjman4life
I did this mod with a 95-98 zj kit. I had to use a e brake cable from a ford explorer on my 01 because the second zj brake cable was too short. I also had to get longer studs from advance to replace the old ones. It was a nice upgrade and only had to modify the backing plate center hole slightly to work. It brakes much more controlled and in a straight line vs pulling to the left or right before because of improperly adjusted rears.
I used the cables from an exploder and the driver side cable is too long to tighten up.
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Unread 01-28-2012, 01:31 PM   #13
foggybottombob
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Quote:
Originally Posted by Mwildmann View Post
Like was said above, if your drums arent functioning properly, which i have seen a lot on XJs, the disc upgrade will offer greatly improved breaking performance. I noticed a huge improvement in mine and it's one of the best mods i've done so far. And of course there is the much easier maintenance to boot! It's cheap and easy and there just isn't any reason NOT to do it in my opinion.
The reason not to do it is that it is a pain to get the front and back braking balanced. The easiest thing to do when your drums are not functioning properly is to fix your drum brakes. I had put disk brakes on two different rear axles in my CJ and I can say that it was a lot easier to deal with the original drums than the new disk brake setups on either axle. If you put disk brakes on a rear axle that did not originally have them then be prepared to tweak the rear brake system.
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Unread 01-28-2012, 09:03 PM   #14
midtownboarder
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i swapped liberty discs onto my rear 44, easier than a gc swap imo if you can find the parts easy enough...
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Unread 01-28-2012, 09:15 PM   #15
Azzy
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IMHO.. the rear conversion is worth it to never, ever have to deal with the drum system again. I very much dislinke those... at least the parking brake is simple, like motorcycle drums.

Any truck or car drum system is a pain with all those springs, adjusters, and other bs. Ive had no issues, without using a proportioning valve mod, in my xj with zj discs. I have enjoyed the increase in performance, which I compare to the new rears I did on my wife's xj. Granted, it may also help that I went to braided lines, which will make for a bit less give in the hoses.
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