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Discussion Starter #1
I recently purchased an original US master cylinder for 1969 Camaro that had not been on a car for quite some time. I'm going to have it rebuilt but I am trying to get it completely disassembled so I can apply a zinc phosphate finish on it before sending it out. I have removed the clip on the back and got the rear piston out, I then removed the set screw on the inside of the bowl but the front piston seams to be stuck. Any suggestions greatly appreciated.
 

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Place MC in a drain pan sitting on the mounting surface.
Blow shop air into the top brake line port.
The air should push the piston out the sleeve.
 

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Discussion Starter #3
Thanks for the help, I just tried that but still stuck. I'm going to soak it today and try again tonight. Any other suggestions?
 

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Insert removal, sliding hammer.
Piston removal, heat gun or propane torch to the cylinder.
 

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Bottom linew if the piston is stuck so hard inside then that means 99 time out of a 100 the borees are so corridede /scored u will need to buy a new one or get that one reseelved...and resleeving cost way more than replacing.
 

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Discussion Starter #7
Bottom line up front. Thanks for the help! Here is what worked:
I took the MS in to work today and let it soak in the echo friendly parts washer. I purchased a cheap dent pulling slide hammer on the way home and it worked great for pulling the brass seats out. This allowed a better seal when trying to blow into the line hole but it was still stuck. Then I applied some Kroil oil and let it sit some more. Finally used a 1/2'' drive extension and a light hammer to free up the back piston and get it moving freely. After that, the piston finally came out with air as initially recommended. Tomorrow I will have this thing hot tanked then bead blast and zinc phosphated so i can send it up to Karps to be rebuilt. Thanks again for all of the effective advice.
 

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Juyst curious here...hadny been on the camaro for some time..OK but to seize up that much where had it been? ot in the weather with no lid for 30 yrs.
I have done many orginal MC and slave cylinders, often from old vintage that have been out in a farmers paddock for decades,..even filled with clay, but never have seen one that bad lol.
 
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