Squealing from rear wheels - brakes/hubs?

[mrrossdude]

Hi all, hope someone could help with a noise on my ST220. 

This is the noise I'm talking about. Its coming from both rear wheels, but mostly rear left. Engine is turned off in video. 

It only starts after the car has travelled over a few miles, and it's more prevalent on a hot day. It doesn't seem to go away when the brakes are pushed, and the noise is tied to car moving speed. 

I jacked the car up (albeit when cold) and checked the calipers, regreased slide pins, regreased the pads and checked to make sure handbrake was releasing properly. Everything brake wise seemed fine, pads are a couple years old but have LOADS of material left. Discs don't seem warped. Wheels seemed to turn freely. 

My only other thought is whether it's the hubs. The sound seems like a rubber squealing (or like a squeegee on glass), and the only bits of moving rubber I know of are in the rear hub. 

Rear left has suddenly got very loud today, and right has slowly started aswell. 

Any input or opinions are appreciated, and sorry for the long post.

 

Cheers, Tom 

[Damien]

seized slide pins or seized pad slides???