This is a common problem on the VW polo and Golf after heavy rain or vehicle been through a car wash and vehicle parked up without getting brakes warmed up and dried out the rear brakes bind up inside the drum. place the vehicle in gear, and chock/block in front and behind the front wheels to prevent vehicle from rolling, remove rear wheels from vehicle, release the handbrake and tap around the drum several times and you will feel it release and start to turn like it should. do this to both sides if they are both jammed on and drive vehicle once back together to get warmed up and remove residue.
I have added the above link just to give you an idea of the parts involved.
I have added a diagram of the rear drum brake setup in case you want to remove the drum and clean them up.
Hope this helps with your repair. Please keep us updated on your repair outcome and do not hesitate to contact us again for further information or assistance.
Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed. Thanks for using 2CarPros. Dave H
Saturday, February 27th, 2021 AT 12:44 PM