Leaking brake fluid

[mikulencake at comcast.net (Paul Mikulencak)]

My 81s is leaking brake fluid from the passenger rear side.  I do not
know much about drum brakes and was planning to investigate this
weekend.  It does not appear to be leaking from the bleeder valve so I
guess it is happening inside the drum?  Like I said, I am not sure what
happens inside the brake but I was hoping to get some advise before I
begin my investigation.  Any advise would be helpful. 
 
thanks
 
paul