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Push the caliper pistons fully in.Pour fluid from the top and watch it always so it never runs out of fluid during the procedure.Turn the bleeder on the caliper counterclockwise 3/4 of a turn.Have a tube attached on the bleeder with its other end in a bottle.Press the lever once all the way in. Hold it pressed.Close the bleederRelease the leverRepeat until no air bubbles comes out of the bleeder.You should already feel a little pressure on the lever.Now start pushing the lever 10 times (pressing the master cylinder) and on the last one, hold the lever in and open the bleeder. Close the bleeder and release the lever.Repeat that until no air bubbles comes out of the bleeder.At this point you should be ready to ride.If you still don't have pressure on your lever, you need to take the brake master cylinder apart for repair.
run some seafoam through the tank to clean up a little of the crud thats bound to be in the lines and carbs, check all the fuel and brake lines, flush the brake fluid both front and rear, change the oil filter, air filter, and spark plugs. get a shop manual and go from there.
May be the pistons in the caliper are pushed to one side. It should sort it's self with normal use. But to chack set the bike on main stand and with the front wheel in the air spin the wheel to see if the disc is warped or thw bearings are gone in the wheel hub.
probably your speed sensor gone down its a common problem, its held in with a 5 mil allen key and is located on the front sprocket cover if i rember correctly its a little black box just un bolt it and un plug it ,and fit the new one ,
hope this helps