I faced the same problem to a chinese made bike only to find out that the brake master cylinder rod at the pedal was not properly adjusted, it was too tight in and had no free play, so tht was activating the caliper., please try to adjust this first and then its not bad to totally overhaul the calipers ..please visit this site :- http://www.motorcyclistonline/caliperclean/index.html
Hope this helps!
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