dinky roll out of control when you add brake the dancer jumps up and down, bottoms out
putting slack in web letting it crawl from side to side
already set backlash and cable , new brake pads.
Have you checked if the rotor is warped?
Are you just running the dink by itself? I run our dinks with little brake on them and the other rolls with more brake. We also use the wheels on the top of the folder to help pull.
rotor is not warped , a little brake or a lot brake doesn't matter when i get up to speed that's when the
dancer starts bouncing and bottoms out then catches slack back up almost poping the dinky