i have a 87 syncro and i just replaced my rear shoes and wheel cylinders.  i
bled the brakes till new fluid and no bubbles were present.  i readjusted the
rear adjusters  through that stupid little hole till all felt well.  took it
out in a test area and at first it felt great, then the pedal went to the
floor. yikes!! i checked for leaks= none. i cant pump them and they feel
fine. 2-5 seconds later the pedal goes to the floor.  has anyone else had
this problem? i have the Bentley book and i work on Navy helicopters i have
always owned vw's and i am stuck on this one. could it be the booster or the
master cylinder? i don't know but how can i tell?

tia

Kurt Thomas
87 syncro