[s-cars] brake system problem

[qbrian at ptd.net]

im hoping for help diagnosing, and a suggested repair if you think you know 
the problem.

its a frighteningly fast vibrating,pulsating mess of a pedal travel. feels 
as though the abs is actuating the whole way down. 

the pads all around should be in good shape considering time. but the(e-
brake) brake warning light is now on.

interestingly enough, if i come to a complete stop, then press&hold the 
pedal down with authority, the symptoms will clear temporarily.

also, theres an audible hiss the fist inch of pedal travel back upwards.

could i possibly have a leak that tainted the system with air or water?

i experienced similar in my 5000, but thanks to the nifty abs defeat switch 
my s dissapointingly lacks, i was able to ignore the problem that 
maraculously cured itself.

its said that timing is everything, and this is no exception. as i was 
potentially driving to viginia so i could have both my 4k&urS at carlisle 
next weekend.

say; sa-da-tay and feel okay...thanks for any help, -brian