brakes squeaky after wheel removal

[White Noise]

today i took both wheels off the bike to get the tyres changed, put the wheels back on fine and went for a ride, then noticed that on braking at low speeds the front brakes are squeaking, and they weren't before the wheels where removed
not sure why they are as the only things that i can think if is the pads may have moved out of there original siting position on the pistons and the caliper mounting bolts have been removed. i have tighted the mounting bolts as much as i can but still there is a squeak, next step it reapply copper grease to the back of the pads. if this doesn't cure it i'm at a loss! any one got any ideas what else it could be?
Cheers
WN
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Buy my wife: 96' Yam XJ600s (Diversion)
Wing Commander White Noise - SE Clique
Riding Tip #86: See God, then back off a bit: Problem is i haven't seen god yet, just a close up of tarmac on revett straight

[Kickstart]

Hi

Give everything a good clean. Brake dust can trigger the squeak. Also copper grease on the back of the pads.

All the best

Keith
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