If it's a Mk3, it could be as simple as the handbrake cable knocking on the rear arm.
It's supposed to sit in a little clip that can break.
A cable-tie wrapped around the handbrake cable and arm might cure it.
It is very annoying, I went through the same procedure as you until someone mentioned the above fix on here.
Hope that helps.
Nick
It's supposed to sit in a little clip that can break.
A cable-tie wrapped around the handbrake cable and arm might cure it.
It is very annoying, I went through the same procedure as you until someone mentioned the above fix on here.
Hope that helps.
Nick