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Eric, Automotive Repair Shop Manager
Category: GM
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Experience:  20+ yrs. experience as repair shop manager and technician.
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How do i remove the rear rotors on a 99 gmc 3500HD

Resolved Question:

how do i remove the rear rotors on a 99 gmc 3500HD
Submitted: 5 years ago.
Category: GM
Expert:  Eric replied 5 years ago.

You will first need to remove the axles, then you will be able to remove the rotors:




View Full Image

  • Remove the flange bolts.
  • Lightly tap the axle shaft with a soft-faced hammer in order to loosen the shaft.
  • Grip the rib on the axle shaft flange with a locking pliers. Twist the axle shaft flange in order to start the axle shaft removal.
  • Remove the axle shaft from the tube.
  • Remove the gasket.
  • Clean the axle shaft flange and the outside face of the hub assembly.





  • Loosen the brake caliper mounting bolts. Do not remove.







    1. Remove the brake caliper mounting bracket bolts.





    Remove the brake caliper and the brake caliper mounting bracket as an assembly.




    Rear Axle Hub



    Tools Required

    • J8092 Universal Driver Handle - 3/4 inch - 10
    • J2222-C Wheel Bearing Nut Wrench


    Removal Procedure

    1. Raise the vehicle. Refer to Vehicle Lifting.
    2. Remove the tire and wheel assembly.
    3. Remove the brake caliper.
    4. Remove the axle shaft.






    Remove the axle nut retaining ring.









    1. Remove the key.





    Remove the adjusting nut using the J2222-C.






    Remove the adjusting nut.








  • Remove the hub from the axle housing.
  • Remove the rotor
  • The lug studs need to be pressed out to separate the rotor and the hub

    Customer: replied 5 years ago.
    Expert:  Eric replied 5 years ago.

    can you clarify.

    I have no idea what "a.7" means
    Customer: replied 5 years ago.
    i meant to say that my axle does not have the flange with 8 bolts like your diagram
    and that is probably where i am messed up. so i am not sure how to remove the axle
    the axle does have an outer flange but no bolt heads are showing
    Expert:  Eric replied 5 years ago.

    single or dual rear tires?
    Customer: replied 5 years ago.
    dual rear tires
    Expert:  Eric replied 5 years ago.

    it has to have bolts on the flange for the dually, unless not the original rear end

    does your rotor look like #8 in diagram:
    Click image to see an enlarged view

    or this:

    Click image to see an enlarged view

    Customer: replied 5 years ago.
    the diagrahm with the #8 looks a backing plate for shoe brakes to me.
    but my axle doesnt match the other diagrahm either . maybe i am wasting your
    time ... sorry and i am not sure if the axle is original, it might not be.
    is there any other way to secure the axle in place besides with 8 bolts.
    all my other trucks have the same 8 bolts and flange like you are showing
    but they are all fords
    Expert:  Eric replied 5 years ago.

    on the heavy duty, they are secured with bolts. I have never seen a gm dually that didnt have bolts on the axle flange holding it.

    on the single rear with 9.75 or smaller rear end, the axle shaft is held in be c-clips inside the carrier.
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