brake problem with '90 CQ

[hayasht@vrg.toronto.edu (Takayuki Hayashi)]

Hi,

Two months ago, I had the brake fluid changed on my CQ because the pedal was
starting to feel spongy.  After the fluid change, the pedal firmed up and
I was happy.  

But recently I have another problem with my brakes.  The pedal 
still feels firm BUT I need to apply A LOT of force to stop the car.  Is this
a sign of a dying P.A.?  (When I start the car, the brake light stays on 
for about 15 ~ 20 seconds but it never comes on when I'm driving.)
 
BTW, I checked both the brake fluid and hydraulic fluid level and they are both 
fine.

Thanks in advance.

-------------------------------------------------
Takayuki Hayashi
1990 Coupe Quattro 20V
hayasht@vrg.toronto.edu
Department of Electrical and Computer Engineering
University of Toronto
-------------------------------------------------