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> frozen caliper pistons, how do I get them out???
skline
post Oct 14 2006, 05:54 PM
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Alrighty, I am rebuilding 4 911 m calipers, for vented rotors. On some, the piston will not push itself out with air pressure, they are stuck.... Help! I need to do this myself and I am cheap lol. Heat maybe?

BTW this is DRIFTERJAY...not scott...
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Lou W
post Oct 16 2006, 12:08 PM
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QUOTE(Eric_Shea @ Oct 16 2006, 08:32 AM) *

You have a very late rear caliper. 75 or 76. I hate those clips. Looks like you've got it tackled but for future referrence, I use a pick and a small blade screwdriver. I use the pick to pull up the corner and slide the screwdriver under the clip and pop it out.

Does the handbrake arm come out? Yes. You will have to destroy the 25mm welch plug to do it though. We don't mess with those unless there's an obvious problem. Repair kits for that section alone are $49.00 from your favorite Ferrari vendor (read: more than a decent core is worth).

If you're insistent then here's what I do: Take a dremel with a carbide cutoff wheel and etch a notch "just" through the surface of the welch plug. The end of the arms is on the other side so... just enough to cut through. Get a large screwdriver and peel the welch plug out. Take the small clip off the end of the arm and the arm and rubber seal will slide right out. You may be able to reuse the seal if it's not in bad shape but... if it's not in bad shape, what the hell are you doing all this for? (IMG:style_emoticons/default/w00t.gif)

Seriously... you may be able to reuse it if you find a 25mm welch plug. PB Blaster touts itself as a seal restorer. It's actually a seal sweller. A small bit of PB plaster on a cloth to clean off the seal should make it work but, make sure you get it in the groove and put back together asap.

This is good info for those having a small adjuster o-ring leak. A little PB blaster on that area may swell the seal just enough to fix the problem. Any fix like that should be viewed as temporary but...


I think I'll hold off from removing the lever, do you think I will run into any problems effecting the E-Brake ability by powdercoating with the lever in place? I know you have powdercoated calipers, but did you do any with the E-Brake setup intact?

QUOTE(davep @ Oct 16 2006, 08:45 AM) *

Lou, you didn't say you were trying this trick on the 914 rear calipers. It is a bad practice to just use hydraulic pressure on 914 rear calipers alone. It is far better to use the adjusters along with pressure. Adjust a little , then force a little. You can permanently damage adjusters by using pressure alone.


No (IMG:style_emoticons/default/smile.gif) the rears came apart the correct way, no hydraulic or air pressure was used.



Note to myself: even though you may have "tinker time" available, next time just ship them off to Eric. (IMG:style_emoticons/default/dry.gif)
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Posts in this topic
skline   frozen caliper pistons   Oct 14 2006, 05:54 PM
Aaron Cox   got a grease gun? use hydraulic pressure to make ...   Oct 14 2006, 05:55 PM
Lou W   :popcorn:   Oct 14 2006, 06:02 PM
davep   Like Aaron says, hook it up to a master cylinder. ...   Oct 14 2006, 07:47 PM
Joe Ricard   PB blaster around the piston to caliper interface....   Oct 14 2006, 08:03 PM
Lou W  
QUOTE
  Oct 15 2006, 06:02 PM
Lou W   No I should have tried that, I think I was too imp...   Oct 15 2006, 07:06 PM
Eric_Shea   You have a very late rear caliper. 75 or 76. I h...   Oct 16 2006, 09:32 AM
davep   Lou, you didn't say you were trying this trick...   Oct 16 2006, 09:45 AM
Lou W  

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