I recently got my rear discs and pads changed as there was a scraping noise (metal on metal I'm guessing) anyway, I only thought it was the pads, but was advised by the garage that the discs would need changing too as they were scored. So I agreed, and paid for the services. This was about a month ago. On my way into work earlier, I was hearing the same noises as before, but only coming from the the right rear side. I pulled up into works carpark and had a quick look, but it didn't seem like there was no pad left, but the top of the disc disk look scratched. Does anyone know what this could be? The car has probably done no more than 600ish miles (motorway) since they were changed. Am I within my rights to go back to the garage and get them to inspect it without any cost to me?