My rear brake pedal started sticking down today while riding. I have to use my boot to get it to fully release. It's not the pivot arm I loosened it completely and it still sticks so I'm guessing it's the master cylinder. Anyone else run into this and if so what was the problem?

 

What year and model is the bike?

 

Weird not sure why my signature isn't showing. It's a 16 SGS

 

Try bleeding it man, or cleaning the pistons off with some brake cleaner.

 

I'm guessing bad master cylinder or abs problem. Either way I'm heading to the dealership for warranty work. Brakes are nothing to screw with.