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Old 05-08-2012, 12:00 PM   #1
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1999 Tj Brake rotors 2 sizes?

So I need new brakes and was looking at JC Witney/Amazon and you can get badass rotors/pads for a great price. I tried to order but it seems there is 2 rotors that were used that year. I emailed the brake company and they said you need to measure the "top of the hat".... so if you have a 99 TJ and order online rotor beware! Measure everything first.

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Old 05-08-2012, 01:21 PM   #2
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Chrysler changed the wheel bearing assembly in the 1999 model year which is why the rotors are different.

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Old 05-08-2012, 01:34 PM   #3
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I replaced mine a year or so ago, autozone had no clue and guess what I ended up with....... the wrong ones. Think I had to get the ones for a 2000 TJ
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Old 05-08-2012, 01:36 PM   #4
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As I recall some are cast and some are machined to add to confusion.. I can recall which work with the hub but if ya get the wrong one.. the jeep will not move...
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Old 01-16-2015, 08:42 AM   #5
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Yes 2 different sized rotors and hub assembly. I am switching from the older "composite" style rotor to the newer "cast" style. My question is will my caliper need to be changed also???
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Old 01-16-2015, 08:51 AM   #6
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Yes 2 different sized rotors and hub assembly. I am switching from the older "composite" style rotor to the newer "cast" style. My question is will my caliper need to be changed also???
calipers are the same. your unit bearings will need to be changed to the new style. order unit bearings for a 2000+ TJ if you are using 2000+ style rotors.

you can't mix and match unit bearings and rotors. You must use either all old style or all new style.

The caliper will not operate properly otherwise - it will remain locked up.

If you're looking for upgraded brake pads and rotors, your best option will be Black Magic Brakes... www.blackmagicbrakes.com
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Old 01-16-2015, 08:59 AM   #7
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Yea I have the newer rotors and the newer hub unit, is the caliper the same? I can only find one part number for the TJ.
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Old 01-16-2015, 09:29 AM   #8
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Originally Posted by UnlimitedLJ04 View Post
calipers are the same. your unit bearings will need to be changed to the new style. order unit bearings for a 2000+ TJ if you are using 2000+ style rotors.

If you're looking for upgraded brake pads and rotors, your best option will be Black Magic Brakes... www.blackmagicbrakes.com
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Old 01-16-2015, 08:40 PM   #9
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Chrysler changed the wheel bearing assembly in the 1999 model year which is why the rotors are different.
No, they changed from a composite cast iron rotor with a stamped steel rotor hat to a full cast rotor in/around mid 99.

In 2000, they fixed the mistake of the incorrect registration hub for the rotor, and the amount of hub that protruded to center the factory rims on.

Once that was squared away, they then moved the whole mess closer to the knuckle to compensate for the thicker rotor hat. That put them back to the published track width specification.

The caliper is the same from 90-06 for the YJ, TJ, MJ, XJ, and ZJ as are the brake pads.
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Old 01-16-2015, 08:45 PM   #10
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Originally Posted by kmj29elj View Post
So I need new brakes and was looking at JC Witney/Amazon and you can get badass rotors/pads for a great price. I tried to order but it seems there is 2 rotors that were used that year. I emailed the brake company and they said you need to measure the "top of the hat".... so if you have a 99 TJ and order online rotor beware! Measure everything first.
If you lay the rotor on a flat surface and measure from there to the top of the hat, you won't always be able to tell which rotor you have from that dimension.

The only correct way to measure them is from the inside of the rotor hat where it sits on the Wheel Mounting Surface to the inboard face of the rotor.

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