hiya Pink Princess..
I take it the air pressure has the air built up properly?
air over hydraulic brake systems can be a nightmare and if the truck is left standing for long periods as i suspect your horsebox is you can get problems.....
seized calipers are common on the eurocargo's....but
don't rush out and buy new ones before you've
checked the master cylinder cos they sieze up too and
can cause brake binding and hot brakes
the good news is you can have the calipers re-manufactured for a fraction of the cost of new ones
good luck with it
Richard
RICHARDS RESCUE & RECOVERY 07707-200-999, July 2008