I changed over from v-brakes to disks recently. I was persuaded they were better and overall less maintenance. But I am cheesed off with the back brake squealing, so I went to the bike shop to get some more pads. I looked at the brakes carefully and got some that appeared to be compliant. When I got home, I found they did not fit. So I take the pads back and buy some others on-line, taking care they were compatible with the type of disk I'm using. They don't fit neither, so I've wasted £12. Why do they do this? I feel like slinging out my discs and going back to v-brakes.