Brake squeal from R Rear.

[GWL]

I am not usually on this part of the Forum as I run a LS. But my son has just purchased a 2006 Navigator and is experiencing a brake squeal from the R Rear while driving slowly in a parking lot. No squeal when driving under normal speed, just driving slowly. He is a trucker on the road a lot, so his wife took it to the dealer. She got the old standard "they all do that" answer from the service writer. Checking here to see if anyone else had had similar symptoms. It would seem that a vehicle that costs as much as the navigator, would be able to drive through a parking lot without brake squeal.

 

[KSnav]

I have it on occassion, but have found setting & release the parking break stops it.
The problem is I can't get it to do it at the dealers!