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brake caliper rebuild help!

Discussion in 'XJ Technical Chat' started by jmilliken, Jun 3, 2013.

  1. jmilliken

    jmilliken Well-Known Member

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    I need some help rebuilding my caliper pistons (dual piston calipers). I used the grease gun method to get one out. I tried the grease gun method on the other piston + neither would move... I ended up blowing a seal on my grease gun. I tried my spare set too, i was able to get one piston out on each of those. any suggestions for getting the second piston out, or for the 2 that are siezed up? I've never rebuilt calipers before.... always bought rebuilt ones........
     
    jmilliken, Jun 3, 2013
    #1
  2. jmilliken

    jmilliken Well-Known Member

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    oh yea... what's the best way to clean all that grease out too????
     
    jmilliken, Jun 3, 2013
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  3. JPaganel

    JPaganel Well-Known Member

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    I used water, a bolt to plug the inlet, and a propane torch. I didn't care about the piston, though - I bought new ones.
     
    JPaganel, Jun 3, 2013
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  4. Foolber

    Foolber Member

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    i used a combination of a torch (map gas) not directly on the piston back close enough to get it hot, and boiling water poured on the piston, then used ice cubes to cool the piston a bit so it would shrink, then poped em out with the air compressor!
     
    Foolber, Jun 3, 2013
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  5. RickCoMatic

    RickCoMatic Well-Known Member

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    One "Last Resort" is, ... adding a bit of water to the Caliper ... Plugging-off both the Bleeder and Banjo Bolt Hole ... Heat the Caliper to boil the water and have the Steam Pressure force the Piston out.

    Use Extreme Caution.
    The Piston could be expelled with great force.

    (There is a "Shadow" on the Piston where the Piston can be grabbed with Channel-Locks and the Tool Marks not affect the Hydraulic Seal.)

    Really ... last ... resort.
     
    RickCoMatic, Jun 3, 2013
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  6. Captainkirk

    Captainkirk Member

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    Compressed air has always worked for me. No grease to clean up, either.
     
    Captainkirk, Jun 3, 2013
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  7. adrian1

    adrian1 Active Member

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    put freed piston back in and secure with G clamp. Pump other piston out with brake lever. Messy, but works for me
     
    adrian1, Jun 3, 2013
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  8. ryancdossey

    ryancdossey Member

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    As far as cleaning them even of brake dust i used a can of compressed brake cleaner and. Tooth bush.


    Compressed air to get the pistons out.
     
    ryancdossey, Jun 4, 2013
    #8

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