2008 650 Outlander XT rear brake stuck on

Hello everyone,

My rear brake is stuck on, I changed the pads, changed the caliper, and the master cylinder and it is still stuck on!!! I can barely move rear brake pedal if at all. It’s at full pressure. I’ve re beld the whole system, front brakes working fine. Rear brake is locked up.
The tail light is stuck on also. Any ideas?
650 Outlander 2008 xt

Thanks!!!:yahoo: