I was just looking at my cars front brakes and i reached through one of the wheel openings and felt a piece of paper in the caliper. i was going to try and tear it out, but i didnt because i dont know what it is. it looks like black sandpaper and its all bunched up behind the caliper. what is this? the other side looks the same way. i havent a clue what brake pads look like new or worn. many thanks.
