No brakes - '84 5k

["Horch, August" <Horch.August@tci.com>]

On the way to work this morning, I slid in the ice & rearended a Blazer.
Not hard, prolly 5MPH worth, didn't do anything (additional) to the
Audi, & the Blazer is fine.  HOWEVER, after I started driving again,
when I tried to stop the car, the pedal felt normally stiff for about
2-3 seconds, then the thing went to the floor.  Pretty unfun.  It still
stopped the car, but something obviously isn't right.  I got to work &
looked under the hood & around the car, didn't see anything that had
worked loose, no fluid all over the place or anythign obvious.  The
spare tire onthe Blazer had hit right int he middle of the hood onthe
Audi, nothing got sheered off or anything.  Anyone with things to check?
I'd like to drive the 45 miles home tonight with the peace of mind of
having brakes...  :-)  Many thanks!

-August