Squeal at ~55 mph that stops if tapping brake pedal gently

Hi,

As title really. I get a squeal at around 55 mph sometimes that I believe to be connected to the rear brakes. (Head out window and it sounds like it's from the back)

It happens when not braking though, just driving along in any gear. (Ok maybe not first or second!)

If I tap the brakes it stops. This happens even if I touch them so gently though the car doesn't actually even start braking. Half a second after releasing the slightly depressed brake pedal and it starts up again though.

Any ideas guys? Sticky rear drums?

Thanks
 
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