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Rear Calipers

Discussion in '206/246' started by nerodino, Sep 21, 2006.

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  1. nerodino

    nerodino Formula 3
    BANNED

    May 19, 2005
    1,161
    Suffolk UK
    Full Name:
    Graham
    #1 nerodino, Sep 21, 2006
    Last edited by a moderator: Sep 7, 2017
    Am i missing something? the piston at the bottom of this pic of a rear caliper came out easily with some comppressed air whilst the one which is also operated via the handbrake will not shift. I have removed the allen bolt and behind that is a worm drive which is part of the hand brake mechanism but even with this removed still no joy. Any ideas gentlemen?
    Regards G.P.
    (P.S. it does'nt unscrew or something silly like that?)
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  2. Mondialmike

    Mondialmike Karting

    Mar 12, 2005
    217
    London
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    Mike Hunnisett
    #2 Mondialmike, Sep 21, 2006
    Graham,
    Somewhere within this forum there is talk of a special tool for removing one of the pistons (I'm sure I've read it in the recent past). Try contacting omgjon in the Dino restoration post as he has defineitely stripped his recently.

    http://ferrarichat.com/forum/showthread.php?t=94232

    Rgds, Mike
     
  3. John Corbani

    John Corbani Formula 3
    Honorary Owner

    May 5, 2005
    1,153
    Santa Barbara, CA
    Full Name:
    John Corbani
    #3 John Corbani, Sep 21, 2006
    Had mine apart a long time ago and seem to remember that you could move that piston with the retracter/adjuster under the hex nut on the back of the caliper. The auto adjuster takes lots of pressure to move. In the thousand psi range. Try the adjuster and see what happens.

    John.
     
  4. jselevan

    jselevan Formula 3

    Nov 2, 2003
    1,873
    #4 jselevan, Sep 21, 2006
    G.P. - the "worm gear" is in itself an Allen screw. You must unscrew this Allen gear from the piston. As the gear introduces a 180 degree rotational conversion, treat it like a left-handed thread and unscrew the rod holding the piston in place. This all will become evident once you remove the piston, but it will not come out until the rod, driven by this gear, is threaded out of the piston.

    As I read the my note above, it makes little sense. All I can say is that piston on the handbrake side is being held by a central threaded bolt, which is removed by turning the gear.

    Hope this helps.

    Jim S.
     

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