I need to put a longer hose on my Juicy 7s to fit on new bike, however i cant seem to remove the caliper banjo end. One part rotates but dosnt seem to undo.

Any advice on how to do this would be very much appreciated, do I just pull?

Avid hose fittings – i.e. the banjo or the 'male' adaptor (Elixir) – are a factory pressing and not 'demountable'.

If you need a longer hose you'll need a new Avid hose. Alternatively, fit a braided hose. They cost roughly the same.