brake question

["Lewis Eig" <leig@crestron.com>]

my 74 tr-6 seems to have almost no brake pedel, meaning, I step on the
brakes and it goes to the floor, it has gotten worse,  and I have not
investigated, so, bear with me....the fluid is full, and the pads are decent
all around....could it be as simple as needing to adjust the rear
shoes....since I have not lost fluid (fluif) my only other guess is an
internal leak within the master cyl itself.
-Lewis