Seized rear calipers

[randykyra]

OK,
Just pulled the rear calipers from my 68 SWB , there L-Caliper. I took a big "C" clamp and was able to get them to compress. I've attempted to use air to get the cups to pop out, with no luck. They wont budge... I've pulled the rubber dust shields and I'm trying to soak the cups with PB blaster. I'm going to let them sit a day or so then try applying air to them again. Any other suggestions how I can get the cups out for a rebuild?

[john walker's workshop]

Reattach the hose, bleed, block one piston and pump out the other with the pedal. Clean up that side, put it back in, bleed, block and pump out the other one. Once that's done, disassemble and do a proper rebuild.

[DeRRis]

If John’s method doesn’t work you can try this. Split the caliper. Drill a hole in the middle of the piston. Tap some tread in the hole. Screw a bolt in the piston. When it bottoms out it should pull the piston outwards.

[SkunkWorks]

I've used the grease gun method before for mine. Just make sure you clean, clean, and clean the calipers out thoroughly after as the grease and new seals won't get along.

Grease gun connected to bleed nipple, block off the brake hose side, and squeeze grease in till pistons start move out. Benefit of this is you don't blast pistons or brake fluid everywhere.

[porsche930dude]

Why not use brake fluid in the grease gun? I have a grease gun that I use for coolant to pump up the hydrolastic suspension on my mini so it should work for that aswell. just adapt the hose to the brake line fitting

[shbop]

Originally Posted by SkunkWorks

I've used the grease gun method before for mine. Just make sure you clean, clean, and clean the calipers out thoroughly after as the grease and new seals won't get along.

Grease gun connected to bleed nipple, block off the brake hose side, and squeeze grease in till pistons start move out. Benefit of this is you don't blast pistons or brake fluid everywhere.

+1 works like a champ

[Oneredspyder]

Ha, I went to a tech session where the mechanic blew the Pistons out with grease and it exploded all over him, quite a site. I have always had luck with air, or I would hook it back up to the car and follow the method above.

[rbogh901]

Originally Posted by john walker's workshop

Reattach the hose, bleed, block one piston and pump out the other with the pedal. Clean up that side, put it back in, bleed, block and pump out the other one. Once that's done, disassemble and do a proper rebuild.

Brake fluid doesn't compress so the piston doesn't get shot out this way.

[shbop]

Originally Posted by Oneredspyder

Ha, I went to a tech session where the mechanic blew the Pistons out with grease and it exploded all over him, quite a site. I have always had luck with air, or I would hook it back up to the car and follow the method above.

Grease doesn’t compress. Air does, and can be very dangerous if you forget to control the piston. Drop a rag on the caliper, and you’re safe from any grease.

[randykyra]

hooking them up to the car really isn't an option right now. The grease idea is interesting but the clean up maybe a pain. I'm thinking about soaking them in some old break fluid. They've been soaking in pb blaster for a day so I'll get back on them later today or tomorrow and see what happens.
Thanks for the suggestion so far.
Anymore?

[shbop]

After unscrewing the zerk adapter from my grease gun, it screws right into the bleeder. Just saying’��

[randykyra]

OK, I finally got them out. What a pain in the a$$... Soaked in PB Blaster, pushed the pistons in with a "C" clamp, pushed it out a little with compressed air, repeat! They finally came out. I Did have an issues with the crossover tubes. One of the connections would not break loose and i had to drill it out. Looks like I went one size to large so I need to figure that out. I could retap the next size up but I'm not sure about finding a crossover tube the correct size. I need to think this one out. Anyone have any ideas on that problem?
It may all be a moot point because I'm not sure I can even save them. There's some pitting but I haven't spent a lot of time cleaning them yet. I'm going to look and see what's available rebuilt or maybe an upgrade then I'll decide what calipers I'll use.

[shadowjack1]

Send them to PMB
www.pmbperformance.com
855-786-7101

[randykyra]

That would make life much easier but My money isn't unlimited...
I'm trying to save where I can so I can buy everything I need for the car and I can get it back on the road. I'm going to try to just rebuild them myself. Ive done a set of 71S calipers before and they were pretty straight forward. I've starting cleaning them and i think they are usable. I need to get the parts and retap the fitting for the crossover tube. I was looking and there's some fittings I think that will allow me to do this. It's call a Metric to Metric bubble. I think I can retap the original hole to 11mm X1.5 insert this fitting then attach the original 10mmX1 crossover tube to that... Anyone have any insight here? Am I on the right track?

below is the picture of the fitting...





Or does anyone else have any other ideas. Again I'd love to send them to PMB but it's not in the budget....

Originally Posted by shadowjack1

Send them to PMB
www.pmbperformance.com
855-786-7101

[john walker's workshop]

A want ad on the 911 parts forum should produce one. Best to start fresh at this point.