Brake squeal/whine help, please Options

[Cuda911]

This is driving me nuts, since it is sporadic:

I'll be driving along just fine, when suddenly a horrendous squeal/whine starts, and I can feel vibration in the floorboard.

If I tap the brakes, it quiets down for a second, then starts up again. If I tap the brakes a bunch of times, it will often go away completely, and then maybe not come back for a day, or maybe come back in 5 minutes.

I think it's one of the front brakes, but so far I can't quite trace where the sound is coming from. Of course, if I jack up the car and spin the wheels, no sign of any rubbing issues. Wheel bearings seem fine.

Any suggestions?

Thanks!!

[steuspeed]

If it starts making the sound again, have somone walk along outside the car and help identify which corner of the car the sound is coming from. You can be easily fooled. I had a squeal that turned out to be a tiniy rock pinned against the rotor and the dust shield. It would go away when I hit the brakes. Sounds like something more in your case because you have the vibration.