I have also had an issue with a collapsed hose twice in the past, once on an A35 and once on my Dolomite. The collapse in the hose acted as a one way valve so that when the brakes were applied one wheel (or both the back ones with the Dolomite) would bind on. The next day they were free again. In both situations I assumed a sticking cylinder or caliper but both times it was a rubber hose :-)