Rear Granada Disc e-brake adjustment

I have a versailles too, I have heard that the rear brakes dont work worth crap so im going to just do an explorer swap. but for you, i think that your brakes arent adjusted correctly, you have to manually adjust them unlike modern calipers. use a pair of needle nose pliers in the holes on the end of the cylinder to turn in and adjust it to the point where the brakes are rubbing on the rotor then try the e brake, It wont work great but it should work