Thanks . i wasnt aware of that . I guess its like mixing engine oils and coolants.
The local guy at the brake centre sold me "Super Dot 3" about two months ago. I will go back to him for a set of seals. The American master cylinder looks almost the same as an Aussie 1971 Ford XY Falcon tandem unit.
Yes there is a large rear cup seal on the second piston which could be called "Mushy"
Before i imported the 67 into Aus. it sat in a guys ranch in Pinon Hills .California. for 6 yrs. I dont think the fluid would have been changed even though the master cylinder was new.
thanks. Happy new year in Louisiana for tomorrow
. Our new years eve is tonight here.
Cheers and thanks for the info.