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  #1  
Old February 12th, 2021, 19:01
dktool dktool is offline
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Cast or Composite ?

If my 1998 is un-molested, would it have cast or composite rotors ?
My right side unit bearing crapped the bed and I need to order a set.
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  #2  
Old February 12th, 2021, 19:47
Agreen Agreen is offline
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Re: Cast or Composite ?

Should be cast.
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  #3  
Old February 12th, 2021, 19:59
dktool dktool is offline
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Re: Cast or Composite ?

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Originally Posted by Agreen View Post
Should be cast.

Did the composite nonsense only apply to the LP axle ?
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  #4  
Old February 13th, 2021, 05:57
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Tim_MN Tim_MN is offline
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Re: Cast or Composite ?

Nope, you always have to look and/or measure. There is no way to tell what a previous owner or repair shop has installed.

One of the guys in my local Jeep club found a cast dimension rotor and hub on one side, and composite rotor and hub on the other.


Go to the FAQ's and read this one >>> Brake rotor/hub differences through the years on the second page.
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  #5  
Old February 13th, 2021, 10:32
Agreen Agreen is offline
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Re: Cast or Composite ?

Hmm I never knew there was an option.

https://www.naxja.org/forum/showpost...5&postcount=10

Quote:
Originally Posted by Tim_MN
It is possible to have one old type and one new type unit hub. Mismatched hub and rotor type will result in interference between the rotor and the hub and the wheel will be locked up.
Good to know. I thought they were all cast
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  #6  
Old February 13th, 2021, 10:52
maxbraketorque maxbraketorque is online now
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Re: Cast or Composite ?

Wow. Good to know. Is one better than the other, especially with regard to the hub/unit bearing?
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Old February 13th, 2021, 13:05
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four_shot four_shot is offline
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Re: Cast or Composite ?

Cast rotors machine easier during resurfacing. Bearing wise there isn't a durability difference.
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Old February 13th, 2021, 16:19
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Tim_MN Tim_MN is offline
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Re: Cast or Composite ?

No difference in hub durability, and I always buy new rotors for a brake job.

In the olden days, rotors had enough thickness to be resurfaced, but to save weight/cost they are usually made closer to the minimum specification and often don't measure after resurfacing.
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