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Thread: Help Rotor stuck to hub

  1. #1
    Join Date
    Feb 2006
    Location
    Bedford, Texas
    Posts
    19

    Default Help Rotor stuck to hub

    Any advice on how to get a rear brake rotor that may be rusted to the hub off. I sucessfully installed new rotors on the other 3 wheels. Here is what I have done so far to remove this rotor:

    PB blaster spray in bolt holes, around hub, and at the back.
    Wire brush around hub.
    Small rubber hammer to the back of the rotor where the caliper usually sits.
    Wait, drink breaks, hit it some more with the rubber hammer.

    What I thinking at this point:
    Buy a huge hammer and knock the rotor from behind. (worried car might fall off jack stands)
    Hang my head in shame and put the caliper and tire back on this one to drive it somewhere Monday.
    Heat the rotor somehow. (don't have blow torch though)

    Thanks, for any suggestions!
    1995/BMW/540ia/mfr 09/94

  2. #2
    Join Date
    Oct 2005
    Posts
    518

    Default

    You don't really need a huge hammer. I've removed stuck rotors with a regular household hammer before. What you are looking for is a sharp blow to break the rust weld. I'd say keep spraying it down with penetrating oil and use a medium-sized hammer to hit it from behind.

  3. #3
    Join Date
    Feb 2006
    Location
    Bedford, Texas
    Posts
    19

    Default

    Thanks for the encouragement. I'll keep at and try more for a sharp quick blow.
    1995/BMW/540ia/mfr 09/94

  4. #4
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,839

    Default

    no fear bust the bugger off with the heaviest thing to make solid contact with the rotor.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  5. #5
    Join Date
    Feb 2004
    Posts
    4,894

    Default

    Just whack the old rotor at the hub area... hit only the rotor hub section only... the rotor will bounce right off it.

  6. #6
    Join Date
    Jan 2004
    Location
    Nashville, TN
    Posts
    982

    Default

    Losses the adjuster for the rear parking brake. It might be grabbing the inside of the rotor.
    Derek A.
    90 535i 5 Speed - Style 5 17"

  7. #7
    Join Date
    Apr 2006
    Location
    Chicago, Il. U.S.A.
    Posts
    4,243

    Default

    +1 for the brake adjuster if it's dragging.
    +100 for the BFH, just smack that #^%&er!
    Yiou do have the retaining bolt, right?
    "The gas pedal wouldn't go to the floor if it weren't meant to be there"

  8. #8
    Join Date
    Jan 2004
    Location
    Tampa Bay, Florida, USA
    Posts
    900

    Default

    Ramon
    1994 540iA Nikasil EAT Chip
    Tampa Bay, Florida USA

  9. #9
    Join Date
    Mar 2007
    Location
    Liverpool UK
    Posts
    1,536

    Default

    I had the same issue with one wheel when i changed the discs... Turned out the handbrake shoes were stuck against the disc... I had to turn the 'starwheel' adjuster to loosen them off and give the disc a whack with a 2lb lump hammer. That done the trick. Don't be afraid to hit it hard, as long as you have it on a jcak stand and the jack standing by underneath you shouln't have a problem.

    *To loosen the starwheel rotate the disc until you can see it through one of the wheel bolt holes... THen use a flat6 head screwdriver to turn it anticlockwise it should loosen off. (However i ended up finding out after a while that for some unknown reason i needed to turn my starwheel clockwise to loosen the shoes!!! Dont know why... Dont want to know.)
    1995 XJR: 4.0L S/charged straight 6 Auto

    What... It's not broken??? I can still fix it

  10. #10
    Join Date
    Jul 2006
    Location
    El Paso TX
    Posts
    1,534

    Default

    makes sure you have the retaining screw off (smalle allen head)
    If you cant get it off because it is rounded out, it is possible to drill the head out witha LARGE bit and then use vice grips to remove the remainder once the rotor is off.

    Alsop penetrating oil alternated with heat from a prropane torch and a sharp impact froma hammer works wonders in loosening stuck things
    Good luck.

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