I can feel my rear brakes bite a little as I reverse out my drive. They only do it a little and it makes a clunk as the wheel goes round. I'm not sure if its a pad or a shoe. Any advice? It doesn't do it in forwards.

 

It could be one of the stainless shims come out of the caliper jaw and allowing the pad to jump or a shoe is coming loose/unbonded,if its the shoe id look asap before it jams the rear up mate

 

anybody experienced this before?