I have a 15 dyna switchback, my back brake has been sticking down about half way and not returning, i have to lift it back up with my foot after using it (if i dont forget), any idea why thos would happen? Master cycled maybe?

 

I would start with a physical inspection for condition of brake pads, caliper, any leaks? What is the conidtion of the fluid?

 

1, -Look for FOD all around M/C boo and rod.
Kinked brake line
Rusty contaminated fluid.

 

Also...

check at your brake lever pivot shaft and bushing... they can get "Gunked up".

Take it apart, clean it up