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Old 03-19-2015, 10:53 PM
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Front rotors don't fit

Got a 99......researched on brakes before I purchased and just went with factory. my hub measures 3/4 of an inch which means I need the earlier rotors for a 99 model. That's what I ordered and come to find out they bottom out on steering knuckle. Had to get the newer 2000 model rotors to fit.....every where here on the forum says the 99 was split year but it also says I needed the older rotors. Has this happened to anyone else?

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Old 03-19-2015, 11:51 PM   #2
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Originally Posted by Felixg View Post
Got a 99......researched on brakes before I purchased and just went with factory. my hub measures 3/4 of an inch which means I need the earlier rotors for a 99 model. That's what I ordered and come to find out they bottom out on steering knuckle. Had to get the newer 2000 model rotors to fit.....every where here on the forum says the 99 was split year but it also says I needed the older rotors. Has this happened to anyone else?
The unit bearing hub that has a center that sticks out 3/4" is the later hub that takes the newer cast rotor. The early unit bearing hub has a center that sticks up a 1/2", and takes the early composite rotor. Jeep did change randomly during 1999, there was no set date, so some of the 1999's use early unit bearing hubs and rotors, and some use late. Here's some pictures.
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Old 03-19-2015, 11:53 PM   #3
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Damn, I was looking for those pictures earlier and couldn't find the thread with them! Thanks! I'll be stealing them for future reference
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Old 03-20-2015, 10:46 AM   #4
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Excellent information and image :-)



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Old 03-20-2015, 10:51 AM   #5
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We just had an in-depth discussion about this in another thread.

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In fact, I'm just finding out you are 100% right. The split is TJs as well, the '99 model unit bearings are 1.91" from bolt flange to stud surface, the '00 model year unit bearings are 2.13".

I didn't realize that, or I'd forgotten about it. Well done.
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Old 03-20-2015, 11:25 AM   #6
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Just FWIW, if you are doing a brake job and need rotors on a 1999, first figure out whether you have an early or late unit bearing hub, then order rotors from either a 1998 if you have the old style, or a 2000 if you have the new style. It will save a lot of confusion.

You can also measure the rotors if you're sure they were not replaced with the wrong ones at some point.
Jeep Wranger (TJ) 1997 - 1999 Front Brake Package
The new cast rotors will fit the old hubs, but will cause the brakes to drag and overheat. Putting old style rotors on new hubs will lock up the brakes.
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Old 03-20-2015, 12:54 PM   #7
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dont know if this helps but there is also two different rotors both were listed to fit my tj . one is 78mm tall and the other is 82mm tall . i purchased the wrong ones and when i snugged the the lug nuts i couldnt spin the tire . after i got the other rotors problem was fixed .
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Old 03-21-2015, 07:02 PM
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Yep it was the 2000 rotors that worked.....got them all together and drove it.....brakes locked up and found out my calipers were junk cause I half a$$ed and didn't bleed and just collapsed them when putting pads on....lessons learned. There was one pic that I saved and it had the opposite measurement for the early hubs but like I said now I know.

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