Weird grinding noise coming from back

When im driving (especially in the wet) I can hear a weird rubbing/grinding noise. When I lift my handbrake up/push my brake down it stops, but as soon as I release either of them it starts again. It seems like either the handbrake or brakes are grinding when im driving. Does anyone know what this may be?
 
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Remove pads, copper grease rear of pads and edges.

I usually get mine done at the garage when I have my winters on and off though, they don't charge much and they have the wheels off anyway.