take a look
on pg 8-1 left side middle pic
The arm that is connected to the cable there should move forward when you squeeze the handle.
if it doesn't,see if you can move it by hand at the back wheel
pg 18-1 also shows you a pic of that brake arm
unplug the headlight if you are going to try to start it without a battery $30.00 a pop...and it will pop.
I have an 80 And an 81 express.