Scrambler rear brake

If anyone knows how to get the rear auxiliary brake to work on a 2003 Scrambler, please let me know! I bleed it and bleed it and it is still soft. I guess lots of people have this problem. It's got new brake pads on it. It's been like this almost since the day the warranty ran out. Mostly I just did without. If you have any ideas, please let me know!

Rain

Rain, rain go away, please come back some other day................