[Shotimes] Braking problems.

[shotimes@zbuffer.com]

My 91, ABS equipped SHO has had some braking problems lately. When I 
press the pedal, it's almost impossible to know what level of boost I'm 
going to get, if any. There is no solid pattern, it's somewhat random, 
but some things seem to have influence on the problem. It seems to have 
more boost early in the morning when temps are near freezing. Later in 
the day when temps are in the mid 60's, I find there may be little or no 
boost. If I drive harder, the next stop is more likely to have low 
boost.
I'm suspecting a vacuum leak at the booster. Any other ideas?
-mike
'91 SHO