I hear a knock when I go on reverse right after the car was parked for a while (Probably related to rear brakes because of the hand brake.) But right after I go forward it won't do it again.

Anyone has a solution to make it stop? It's not something to worry about I know, it's just anoyying when it happens.

grease your caliper pins, the brake pads are loose or maybe uneaven on one side the oneside could be the bottom side of your rear brake pad and when in reverse clunk, givit a shot mate

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I will try fixing this, thank you!