Rear Calipers

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?)
Image Unavailable, Please Login

 

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

 

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.

 

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.