Clacking front end stops when brakes applied???

Hi all... I'm new to the forum and need your help!!    I ahave a 93 GMC jimmy 4.3 (W) 2 wheel dirve.  I have a clacking noise coming from the front right side.  the clacking goes away when I step on the brakes.  I checked the pads to make sue they hadn't come loose and there is no play in the ball joints, also just put new bearings in the front end due to a bad humming and thought it might fix the clacking to but no such luck.  Any help would be greatly appreciated.
 
Cheers
 

Caliper bolt bushings are shot.

Thanx Detroit,  You were bang on the money!!  I can grab the caliper and shake it around!!  The best part is that the bushing kit is only $15..!!  I was expecting  something expensive..lol.  Thanx again for all your help.
 
Cheers
Brad