If you've got wear lips, it would suggest either the handbrake isn't disengaging or someone's been trying to do some sick skidz.
I've had 3 vehicles with this setup and the handbrake has been rubbish in all of them. It needs to be working 100% in order to scrape through an mot. Any problems with it at all and it will fail.
In order to fit inside the brake disc the shoes are relatively small. It barely works as a parking brake and nearly impossible to use for handbrake turns!
