how to bleed front brakes on 2004 yamaha 450 kodiak  

pump pump the brake lever a good four or five times, then hold the brake lever tight, and have someone loosen the brake bleeders.  make sure to keep pressing the brake lever and hold it until the bleeders are retightened.
and add braske fluid as you go.  make sure the master cylinder cap is on while bleeding

repeat until the brake lever feels good and tight and the brake work poroperly.
do not let off on the brake lever until the bleeders are tightened back up.  if you do it will suck air into the brake lines.