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Also he pic in post 1 indicates that the caging pin assembly is not present. You have one for each dual service brake chamber right ?

The spring. Also is attached a pic of a dual service brake chamber damaged by rust. Dome of chamber on the emergency side is cracking. Even though the individual parts are available to service this unit it was deemed prudent to discard it before the spring inside blasts out and as a minimum...

Reference posts 23 and 26: If it is leaking you didn't say if it was the service or emergency side of the dual service brake chamber. If it is the emergency side throw it out and get a new one. You don't want to mess with the spring therein. On the service side, yes you can replace the...

Yes, in post #1 you can see the carrier for the caging pin. Definitely think about replacing the whole thing. If you manage to get it apart and back together it will likely leak forever.

OP has a single service brake chamber as used on front wheels. It has a small spring inside to make the brake pull back when it is released. The double service chambers from the rear wheels are more dangerous. If the hardware on this chamber is this frozen, probably because someone either drove...