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I have a 07 zzr600 motorcycle, my front brakes are out. When I’m not moving they build pressure, but when Im commuting somewhere they disappear. No pressure or anything. What could it be?
 

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Jack up front wheel, use a pencil or some sort of pointer, spin the wheel and hold the pointer close to the rotor you should see the gap modulate, if it is a long warp it will be gradual.
 

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I think you have a blown ring on your master cylinder. It can create the illusion of pressure until you actually use the brakes and then lose pressure when the fluid passes by the piston. I blew one on a Harley Sporster when I had to make an emergency stop on the freeway. You can replace the internals with minimal time and skill. A rebuild kit should be cheap. All the bleeding in the world won't cure a blown master cylinder.
 
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