Just change my Front brake pads from OEM to Centric Posi Semi-metallic pads, install was OK but when we test drove the car it was making a clunking noise when medium-hard braking..WAHTA!!

bled the front brakes but still have the clunkiong noise, I hope someone can help out, also the clips seems to be correct...I read and my cousin told me about the Hawk pads clips...any opinion helps thanks.

Not likely it has anything to do with the fluid. And if by "seems to be correct" you mean you just looked and/or felt the springs, that's not good enough. Redo it, asap.

now its just making the clunking noise when really hard braking...how long do you have to bed your brakes?

I dunno man, I'd probably just do it again, it's not too difficult, perhaps rotate the pads, and just triple check all bolts. If that doesn't help I might go to a brake place like midas if you trust them, or call the dealer for help if you trust them. Not sure what else to say.