Cast or Composite ?

[dktool]

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.

 

[Agreen]

Should be cast.

 

[dktool]

Should be cast.

Did the composite nonsense only apply to the LP axle ?

 

[Tim_MN]

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.

 

[Agreen]

Hmm I never knew there was an option.

https://www.naxja.org/forum/showpost.php?p=244936625&postcount=10

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 :dunno:

 

[maxbraketorque]

Wow. Good to know. Is one better than the other, especially with regard to the hub/unit bearing?

 

[four_shot]

Cast rotors machine easier during resurfacing. Bearing wise there isn't a durability difference.

 

[Tim_MN]

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.