Please Help! I have a 1985 F350 dually. It has a 7.3l, and a T19. How do I adjust the emergency brake?

Details: the emergency brake is connected, just needs to be adjusted. When I step on the e-brake, it pushes to the floor. Sometimes it holds, sometimes it does nothing. Same when I pull the release. Sometimes it releases, sometimes it does nothing. But you can see the cables running along the side of the frame, and the cables wiggle & shake when you press/pull the e-brake & release (so they are connected). What do I do?

 

2K389 is the adjuster, loosening/tightening the nut adjusts the parking brake.

 

Great image @ND!
Before adjusting the emergency brake cable, be sure to adjust the rear brake shoes. Jack up the rear wheels, make sure there's a little drag when spinning wheels. Not correct if wheel keeps on spinning after a revolution or two.

 

What they said!

 

Great image!! This tells me everything I need to know

 

Thanks for the tip @cuba