brake booster problem

[Lizirbydavis@cs.com]

Hi folks,
The temp has dipped into the 40s so I've finally put the top up.  At first I 
wondered if one of my cats was in my car, as I heard a "mewing" when I held my 
foot on the brake for more than a second.  I guess it must be a booster 
problem.  It may have been doing this for a while, but with the top down I 
didn't hear it.  What can I expect?  The pedal pressure is firm and does not go 
down at all.  Will this gradually deteriorate?
Joe Davis