Sticky Calipers

[david w.]

I have loosened up a rusted piston in my brake caliper by using penetrating oil. I was able to push the piston in, is there a way to force the piston back out so I can work it back and forth?
Thanks.
73T

[Kurt B]

Pump the brakes...I used a c-clamp, pumped them back and forth using the c-clamp and my foot with the caliper in place....your best bet if you don't have a new caliper handy is to work it back and forth and slap a pad on...if it still pulls to that side during braking, you ought to get a new caliper...I did and made a world of
difference.

[This message has been edited by Kurt B (edited 09-01-2001).]

[wckrause]

You can use compressed air. Get a nozzle with a rubber tip, and press it firmly against the brake line opening. Clamp the opposite piston, and place a piece of wood between the two pistons. Be very careful, because the piston will shoot out with great force.

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Bill Krause
'79 911SC Euro
MY PELICAN GALLERY

[FAST FREDDIE]

TRY A BLOCK OF WOOD TO INSURE THAT THE PISTONS DON'T BANG THEMSELVES TOGETHER ALSO WATCH THE PISTON ORIENTATION

[Early_S_Man]

Start with 40 psi, and work upwards in 5 lb increments ... so as to use the minimum pressure necessary!

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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler

[david w.]

Great Ideas! I have a compresor and will try the air idea.
Thanks.

[david w.]

Great Ideas! I have a compresor and will try the air idea.
Thanks.

[david w.]

Great Ideas! I have a compresor and will try the air idea.
Thanks.

[david w.]

Wow! Ive heard of a double post, but never a tripple?
How on earth did I do that!?

It is.........time for a cold one!

[ClayMcguill]

All four calipers on my '66 912 project carwere extremely rusted-I ended up filling them with penetrating oil, then heating them with a propane torch, THEN applying compressed air before the pistons finally slid out.

I've worked on some stubborn parts before, but sheesh.

They sure look nice now that they've been sandblasted, powdercoated red, and rebuilt with ATE kits-sure hope they work as well...

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Clay McGuill '66 912, '97 Jeep Cherokee www.geocities.com/the912guy

[Oldporsche]

I have hear of folks useing a grease gun. They found a method to mate a grease zerk into the line fitting. Then it was a simple task to pump the caliper full of grease and "ease" the pistons out. It took a while to clean it up.

Good luck,
David Duffield

[Oldporsche]

I just looked at the last comment. Hmmmm.
I used to be able to compose a sentence.

Good luck again.

David Duffield

[Nicol4]

I had to soak my front calipers in solvent in an electrosonic cleaner for 10 hours. This freed up one piston on each caliper. I filled the caliper with water with the moving piston in the extended position and put a plug in the brake line connection. I then put the caliper in a hydraulic press and pushed the extended piston in this forced the other stuck piston out. I installed a rebuild kit and they have been working great since Feb.

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Chris Nicol
912e
www.members.home.net/nicol4/porsche.htm

[david w.]

OK!
140lbs. of air.
Liquid wrench I had to work it, but they finally popped out! What a sound it made!
You guys are great.

Thank you.