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93 ZJ Rotor and Bearing Replacement

Discussion in 'Grand Cherokee' started by TinyInkognegroT, Oct 7, 2019.

  1. Oct 7, 2019 at 8:35 AM
    #1
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    I have new rotors and hubs and bearings for my front 2 tires. I plan on replacing them today but I'm posting this so I have everything ready when I get home. My biggest concern is how to remove the brake caliper because I'm not sure if it's a 13 mm bolt or a star socket and I don't have any Star socket sets and don't have money today to buy any so I'm hoping that it's the 13 mm bolts. My other concern is the removal of the bearing and hub, what size bolts are these? Are they hard to remove and is the bearing hard to replace?
     
  2. Oct 7, 2019 at 8:41 AM
    #2
    Prerunner1982

    Prerunner1982 Well-Known Member

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    I think the caliper bolt is a regular hexhead, can't recall the size right off.
    The hub however does have a 12 point head on it, 3 bolts from the back side of the spindle.
    You will have to separate the hub from the axle shaft which takes a large socket and you may be able to tap the end of the axle shaft to get it to separate from the hub.
    I have had hubs seize into the spindle and actually pulled the hubs apart. Had to beat the snot out of them to get them out. Clean up the mating surface of the spindle before putting the new hub in.
     
  3. Oct 7, 2019 at 9:00 AM
    #3
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Good to hear there's no star heads LOL the biggest socket I have is a 30 mm... If I have to put off the bearings until Friday, that's fine and I'll just install the new brakes and rotors today... Slowly but surely I'm trying to get her fixed up.
     
  4. Oct 7, 2019 at 9:04 AM
    #4
    Prerunner1982

    Prerunner1982 Well-Known Member

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    The Spindle nut on my 93 XJ is a 36mm... just went and looked it up. Likely the same on your ZJ. And 175 lbs-ft is the torque spec.
     
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  5. Oct 7, 2019 at 9:09 AM
    #5
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Nice, thanks @Prerunner1982
     
  6. Oct 7, 2019 at 10:23 AM
    #6
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    As another precaution, how can I check the wear and tear on the CV ends of the wheels on the front axle? How can I tell if they'll need replaced or not?
     
  7. Oct 7, 2019 at 12:00 PM
    #7
    aggrex

    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    I'm sure if you had replacements on hand that you can feel the difference in looseness especially with age+mileage of the jeep. Generally if the boots are not torn they should be okay but let's hear from others opinion. Old worn boots could start tearing from age or rough handling right after assembling all the front end parts lol
     
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  8. Oct 9, 2019 at 9:25 AM
    #8
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    PHOTO_20191009_092703.jpg PHOTO_20191009_103933.jpg
    Here are mine... Driver side then passenger side
     
  9. Oct 9, 2019 at 10:05 AM
    #9
    Prerunner1982

    Prerunner1982 Well-Known Member

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    The driverside is definitely in need of being replaced, passenger side may be ok but I would look around that first rib where all the crud is...it is likely torn in there and if you are already doing the hub it would be a good time to replace them both..... if you can, I've been there before.
     
  10. Oct 9, 2019 at 10:26 AM
    #10
    aggrex

    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Clean and inspect boot(s) as the crud may be indicative of boot damage with the lube leaking out.
     
  11. Oct 9, 2019 at 10:58 AM
    #11
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    The crud in the first rib you guys are talking about is on the passenger side?
     
  12. Oct 9, 2019 at 10:59 AM
    #12
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Is that a crack and splits on the driver side?
     
  13. Oct 9, 2019 at 11:05 AM
    #13
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    And is this what I'll need to replace it ?Screenshot_20191009-130345.jpg

    Screenshot_20191009-132238.jpg
     
    Last edited: Oct 9, 2019
  14. Oct 9, 2019 at 11:05 AM
    #14
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Yes

    Yes sir.
     
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  15. Oct 9, 2019 at 11:46 AM
    #15
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Screenshot_20191009-133334.jpg

    Is this everything I need to replace the back brakes ?
     
  16. Oct 9, 2019 at 12:02 PM
    #16
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Measure your drums, they could be 9" or 10". But yeah that looks like a pretty complete kit.
     
  17. Oct 9, 2019 at 12:09 PM
    #17
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    9's are smooth around and the 10's have cooling finsScreenshot_20191009-140659.jpg
     
  18. Oct 9, 2019 at 12:47 PM
    #18
    aggrex

    aggrex Well-Known Member

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    Why are you replacing the rear drums? Are they out of spec? Just trying to stretch your $$$
     
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  19. Oct 9, 2019 at 12:50 PM
    #19
    aggrex

    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Sure looks like some crack...

    IMG_20191009_154932_edit.jpg
     
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  20. Oct 13, 2019 at 1:12 PM
    #20
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Here's driver's side...PHOTO_20191013_145609.jpg
    https://youtu.be/W0POgyonu74
     
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