The best way to fix the parking brake is to install a line lock, all the parking brakes pre 2010 are junk. do a search on parking brakes and you will see that this has be talked about the problems and fixes for your machine.
2009 700 xtx
alum skid plates (fabrication by me)
rear bumper (fabrication by me)
front brush gard (fabrication by me)
crow harnes (4 point)
lower tail light
epi clutch kit
full wind sheild
e brake alarm (utv crap)
sound proof engine cover
trail armor doors
rear sound bar
stage 1,2&3 clutch work by ///AIRDAM
Stock roll cage lowered 3"