'99 brake rotor confusion (PLEASE READ!!!!) - Jeep Wrangler Forum
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Old 12-31-2013, 10:57 AM
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'99 brake rotor confusion (PLEASE READ!!!!)

I was helped by a very courteous member on this forum (water dog) whom took the time to hijack my thread (no pun intended) to advise about a change in the hub/wheelbearing and brake rotor design that will effect the '99 TJ's when ordering these parts.

I just though I would pass along this information to help advise fellow owners of the confusion to help avoid this problem as I was about the put '98 rotors on my '99 not thinking twice about it as in appearance they seem to be the same but are far from that.

Jeep went from composite rotors (early) to cast rotors (late). These different rotors and unit bearings assemblies have slightly different depth measurements. A cast rotor (late) will bolt on to an early hub, and will appear to work, but it pushes the caliper to the end of it's travel and you will wind up with one side always pulling because the tolerence is too close. If you try any put an early rotor on a late hub, the rotor will not turn. Make sure you measure and match the hub heights of your rotors to the originals.

If your Unit bearing hubs have a short hub center section Sticks out about 1/2" they are early and require composite rotors, if they stick out about 3/4" or so They are late and require the cast rotors.

They made the change during the production of the 1999 model year, and there is no "switch over" date. They probably used the old ones up during the year, so without physically checking them, you wouldn't know which ones you have

So to save from confusion at some of these parts stores, would it not be safe to request rotors and or hub/bearing assemblies from a 2000+ as when you search the hub/bearing assembly or rotors the hubs from 98-99 are different yet '97-'99 rotors they list models for '97-'98 compatable with '99 and '99 compatable with 2000+

Just seems to be confusion for this particular '99 year I for one would like to avoid

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Old 12-31-2013, 10:16 PM   #2
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I had the opposite issue with rotors I got when I ordered for my 2000. They sent '97-mid-'99 rotors that were too deep and refused to listen to me when I told them their computer listed the wrong parts. I returned them and got a new set from somewhere else. Anyway, it is always a good idea if you have a '99 to measure your old rotors as shown here.

Measurement of Rotors

Also, when ordering new hubs, you'll need to do the same to match your rotors.

dana 30 front axle bearings and hub assembly - JeepForum.com

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Old 02-16-2014, 11:02 PM   #3
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So I gotta know. I thought my calipers were sitting close. When I ordered the hub assembly the brakes sit awful close to the rotor. Causing running and grooves.

Just replaced the brakes today. Does it mean that I need a shorter (smaller) rotor? Or I gotta get a different year of break shoes? Don't say I gotta get a different hub assembly I know they won't take mine back. Not for a cold day in hell. Especially since the bearing is new(ish) and completely functioning over my bad one.
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Old 02-17-2014, 12:12 AM   #4
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Quote:
Originally Posted by Zeraybah Baba View Post
So I gotta know. I thought my calipers were sitting close. When I ordered the hub assembly the brakes sit awful close to the rotor. Causing running and grooves.

Just replaced the brakes today. Does it mean that I need a shorter (smaller) rotor? Or I gotta get a different year of break shoes? Don't say I gotta get a different hub assembly I know they won't take mine back. Not for a cold day in hell. Especially since the bearing is new(ish) and completely functioning over my bad one.
Guessing you mean brake pads. Either the early or late unit bearing hub will work on your TJ, and either the early or late rotor will work, but they have to both be the same. If you have an early unit bearing hub, you must use an early composite rotor. If you use a late unit bearing hub, you must use a late cast rotor. The same brake pads are used in both cases. Read this: https://www.wranglerforum.com/f210/br...rs-381386.html
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