Clio MK 4
Basically one of my rear tyres looks a bit flat. Not much but noticeable. Anyway i went to the petrol station to put it back up. I put the machine on 30 and did the one which seemed fine to which it was at 25! Got that to 30. Then went to the one which looked flat put the air pressure thing on and nothing happened. it wouldnt fill up nor beep to tell me what it was at. Any ideas?