Giant xtc sx MPH-3 brakes sticking

I was driving back from grizdale last weekend with my bike in the boot. The rear brake lever must have been pushed up against the seat or something and sprained it. When I pull the lever now, the brake works but sticks and will not release until I move the lever forward again.
Any ideas how to fix this? Cheers
Any ideas how to fix this? Cheers
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Giant XTC SX
Ferrari all the way!
Ferrari all the way!
Giant XTC SX
Ferrari all the way!
Ferrari all the way!