Thanks all for the help. It sounds like there is not a quick go to master cylinder for this application. I am confident that unless it needs a new everything that I will get the factory system working properly. before I got it I noticed that someone has been into the rear system, there is new hardware on the backing plates, and some new lines ran, i might get lucky and there is just a leak somewhere. but, knowing trucks that have sat a long time, I doubt I'll be that lucky. I'll try to post any updates as they happen,

thanks again


1937 GMC T16 468 BBC th350, 4.10
1941 Dodge COE 5.9 cummins, 9 speed roadranger
1947 Diamond T COE, hercules and 4 spd, all original
1955 Chevy LCF 9.0L IH diesel AT545
1962 Corvair (Elsie)
1967 Jeepster Commando
1968 K10
1970 Chevy C50 box truck