Are these pads off my sons XR80 toast or no? He layed it down the other day and told me it was because he had to use the front brake coming down a hill. I checked his rear brakes and I had to push the pedal way way down before it would grab at all. No adjustment on the rod made any difference so I pulled these off for a gander. I don't have experience with brakes but I guess the pads are toast? What say you all knowing ones? If so then what exactly do I need to replace, just the pads? Anything else I need to do to do the job right? I'll search for a how to video, I'm sure there are a few about. Thanks.