Hi Jeff I'm using a Castrol automotive DOT 4 green fluid. Great Plains says to use automotive rather than the aviation red mineral stuff because automotive seals are used. Nontheless I reckon you are on the right track with the fluid expansion.
Today was hot, the brakes locked and I cracked the slave bleeder for less than a second just off then on again...about a zillionth of a drop came out and they released right up. So the issue is in the master where I cannot find any external venting at all!! I think this must mean the fluid expansion must be via a port around the plunger that is uncovered at rest....but is there one and how critical must the plunger location be for it to work. I've emailed Steve Bennett for an explanation and I'll post the answer in due course. Oh, and Frank, I have found that by landing upside down I can get around the southern hemisphere problem but then another thing gets me stumped...............I can't work out why the canopy locks up instead of the wheels. :-) John Martindale Family 29 Jane Circuit TOORMINA NSW 2452 AUSTRALIA ph: 61 2 66584767 email: johnja...@optusnet.com.au web: http://www.members.optusnet.com.au/johnjanet/Martindale.htm