I never use the handbrake when parking up my diesel Connie, preferring to use park so on start up there should be no red handbrake warning light. However after a cold frosty night when starting up from cold I also get the light coming on followed by the brake failure warning, but they disappear around a second later never to return the rest of the day. This fault only occurs in the winter months and a friend of mine who owns a 54 reg diesel reports the same issue !
Perhaps it's a case of '' they all do that Sir ''