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are could be that the pads are gone and its not giving it any presure to push them back out i had this happen to mi trailblazer 1 time and i had to pull the old pads(metal to metal) out nad than had not brakes at all
Im just playin with ya - prob got some air in the line - my TB does it - pump the crap out of the brake until it works. Thats what I have to do with the TB once a year