I have this problem yesterday when I had a flat so I just took my bike in to get the rear tyre fixed while i head into uni. Then at the end of the day I picked it up and when they rolled my bike out there were sounds from my rear brake. At the time i thought they might have wiped it so it was clean. I left the place and half way home (25Kms later) I found that my rear brakes were actually on The pads are touching the disc and I get the feeling that my bike isnt rolling as much as it used to(in the morning). Could there be something that they did to my rear brakes? Coz I only took it in with a puncture rear tyre... and now I cant use the bike properly coz of the rear brakes being slightly on. Is there anything I can do? Or just take it back and let them do it?