Pistons are not supposed to be wear items although they're often damaged .
Some W123;s use Phenolic pistons, the worthlees 'rebuilder' who previously did the front calipers on my greymarket wagon fitted them instead of the correct stainless steel pistons 
.
To remove stuck caliper pistons is easy if messy : use your hand grease gun, remove the coupler off the end and gently screw it into the hose port and pump away, making DANG SURE it's not facing you as the piston sometimes comes flying out at great speed .
Clean the piston well using aerosol brake cleaner, alcohol or brake fluid and NOTHING ELSE EVER, re assemble using brake fluid to lubricate the seals , most caliper to piston seals are square section O - Rings and have a slight inward taper if you look for it .
Simple if hard and really messy work .
I envy Max's work shop ~ I can imaging puttering away in there surrounded by old things and stunning natural beauty .
-Nate
Max Wrote :
Yes, You are right Rob. I,ve been looking at parts and it looks like if you need pistons you are out of luck, or I guess then you have to get calipers. The re-build kits I found only have a seal and a ring. I cant remember if I have ever re-built one of these, I guess not but it looks like one of the easier jobs to do. My 59 Ponton had shoe brakes, two cylinders in the front. Horrible brakes. Yep, rebuilding, but first I have to clean the shop and clear my benches. Summer has hit. Max
Posted by: vwnate1@yahoo.com
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