I have exactly the same problem. At very low speed the problem seems to be coming from a lightly warped right rear brake. The sound disappears when I pull the hand brake while driving.
At high speeds, the squeal is loud and high pitched. Now this is the weird part : when coasting at speeds of 50 km/h or more, the noise disappears if I jerk the steering towards one side. When jerking the steering towards the other side, the noise intensifies.

Does anyone have any idea how the steering interacts with the noise ?

Thx.

 

you should take yours to the dealer... it sounds serious.....

 

For me it was the right rear caliper, it had a pad seized in the carrier and was worn to the metal backing. The car had 45000 kms on it. The dealer wanted to do all the brakes which would have run around 900 bucks after taxes and the labour. I went to Canadian tire, bought a set of pads for 40 bucks, cleaned the brake parts with a wire brush, removed the clips and filed the areas under them till they were shiny, re-installed everything and the noise was gone. I had to borrow a tool from Canadian tire to retract the caliper piston to receive the new pads(it was free) after that it was easy.

gimly