That may well be the case John, but I have this problem with taps that were installed just last week.
Jonty, July 2008
I don't think this will be an airlock Paul if there is adequate water flowing when the tap is fully open....more likely the tap simply needs its washer replacing as its bouncing - they do become hard and brittle with age.
John, May 2008
edit
I can answer this question...
how can I remove an air lock from my cold water tap?