Brake Rotor Fitment Differance Between Years

[sinkrun]

Ok I want to buy some GOOD brake rotors Brembo And EBC seem to be the only really decent made ones. Problem is they start at 1991 and go up they don't list any for before 1991 mines a 89. So there must be a differance so anybody know what it is or if theres something I can change so I can use them.

[Jeep Driver]

Yep, believe they changed in 91. There was a recent thread on this topic here somewhere.

 

Swap yer axle I guess if you are serious enough.

[Geonovast]

There are several brake generations. You should be able to get away with swapping steering knuckles, instead of the whole axle.

 

But you'd need the knuckle, unit bearing, and caliper for the year brakes you're using.

[Jeepman]

It is not just the rotors it is the pads/Calipers and Hub assemblies too

 

84-89 is the first style (everything is different)

90-99 they made changes to Hubs, Rotors and Calipers

00-06 changed Again but just Rotors and Hub Assemblies

[Eagle]

I've posted this before, but we'll do it again. As before, this comes from the manuscrip of a book I am (or was) writing, and this IS copyrighted. In posting this exerpt here I am NOT releasing it into the public domain and I am NOT giving anyone permission to copy it or to reproduce it on any other site or forum. Please have the courtesy to respect my copyright.

 

For some reason the quote function isn't working for me, so the following will not appear in a quote box:

 

In general, the parts to be concerned with in keeping the front brakes compatible are the steering knuckles, the hub/bearing assemblies, the rotors, and the calipers. (There is a more complete enumeration of the interrelationship of these parts in Chapter 6, Axles.)

• Only two steering knuckle designs were used: 1984 through 1989, and 1990 through 2001. Left and right side knuckles are different part numbers within each group.
  
• Three different hub/bearing units were used. The hub/bearing units are the same for both sides of the vehicle. The different years for hub/bearing assemblies were: 1984 through 1989; 1990 through mid-1999 (composite rotors); and late-1999 through 2001 (cast rotors).
  
• Three rotor types were used: 1984 through 1989; 1990 through mid-1999 (composite); and late-1999 through 2001 (cast).
  
• Only two caliper types were used: 1984 through 1989, and 1990 through 2001. Left and right side calipers are different part numbers within each group.
  

[Geonovast]

Eagle, everything you posted is for 4wd only, correct? The 2wd stuff is a completely different animal.

[sinkrun]

Thanks for all the great info, I guess for now its off to advance for some China crap as I just don't have time to swap all the stuff mentioned.

[HOrnbrod]

More Stuff:

 

2WD 1986 - 1993 XJ/MJ models used the same one piece hub/rotor, p/n 53002928. Starting in 1994 both 2WD and 4WD models used a separate hub (p/n 53007449) and rotor (52008440)

 

4WD 90 - 92 models used three different rotors as follows:

1990-91: P/n 52008440

1992 (Up To 2-10-92): P/n 52007710

1992 (After 2-10-92): P/N 52008264

[1986Comanche]

2WD 1986 - 1993 XJ/MJ models used the same one piece hub/rotor, p/n 53002928. Starting in 1994 both 2WD and 4WD models used a separate hub (p/n 53007449) and rotor (52008440)

 

Some 2WD Comanches have the 2 piece rotor and hub setup like the 4WD Comanches. My 1986 2WD Comanche has the 2 piece setup like a 4WD. They used both styles in 1986.

[HOrnbrod]

Some 2WD Comanches have the 2 piece rotor and hub setup like the 4WD Comanches. My 1986 2WD Comanche has the 2 piece setup like a 4WD. They used both styles in 1986.

That does not show up in my parts book, and I've never had an 86. Of course, that does not mean that you are incorrect. Do you possibly have the part numbers for the 2WD 86 hub and rotor? I'd like to finish a summary of various brake parts used throughout the MJ years for both 2WD and 4WD models.

[1986Comanche]

That does not show up in my parts book, and I've never had an 86. Of course, that does not mean that you are incorrect. Do you possibly have the part numbers for the 2WD 86 hub and rotor? I'd like to finish a summary of various brake parts used throughout the MJ years for both 2WD and 4WD models.

 

My 1986 factory parts manual shows the part numbers as:

 

Rotor: 3251156

 

Hub: 8953000228

 

It shows that these parts are for both the 4WD and 2WD. I hope this info helps.

[HOrnbrod]

My 1986 factory parts manual shows the part numbers as:

 

Rotor: 3251156

 

Hub: 8953000228

 

It shows that these parts are for both the 4WD and 2WD. I hope this info helps.

 

I show those parts numbers also, but only for the 86 4WD. BUT there's an asterisk after them that's not referenced anywhere. :hmm: It must refer to a certain build date for 86's that they switched front brake parts between 2WD and 4WD. So I'll include that info too. Thanks for the info.