Hi guys and girls. I've changed my rear brake pads and it all went well and they seem to work much better as the old pads were corroded to the retaining clips. I've noticed that on one side the inside line of the disc is still rusty for about 10 mm all the way around. The other side is about 30mm. What have I done wrong? I wondered if the pads are touching the inside edge of the disc near the hub? I can't really see how I'd have got them in the wrong place as they just fit snug onto the clips. Any help would be appreciated. Thanks.