btcota315

My front brakes are still causing friction (2005 TXT280 pro) after cleaning the caliper and replacing one of the pistons & seal that wasn't retracting all the way. With bike on the stand and spin the wheel hard I can get about 4 rotations.Is that acceptable? I inspected the disc. It does not float at all. Not side to side or in rotation of tire. Does the amount of brake fluid have effect? Should the reservoir be completely full? If there is air in the sytem would the pads not retract fully? I would assume if the front tire does not rotate freely it would have a tendancy to skate and have a effect on the rear tire traction?