Is my brake booster toast?

[McCohens at aol.com]

The car is an 80 Quattro with a MC1 swap.  Running the stock brake  system 
without issues for years until recently when the pedal went very  soft.  
Pulling the master cylinder showed the booster "can" with quite a  bit of brake 
fluid.  While replacing the MC I noticed a potential issue  with the 
booster.  The metal rod between the booster and the MC came  out.  It looks much 
like an intake or exhaust valve, with a stamped  part over the "head" to hold 
it in place in the booster.  It looks like I  can just push it back in 
place and remount the MC, but bleeding the system is  such a joy I don't want to 
do this twice.  
So is the brake booster scrap metal or do I just push everything back  
together and continue.
On a good note since I got a 93 MR2 turbo having the quattro down for a  
while isn't a big deal.  Won't even miss it until the winter  time.