Has any one found a good dual curcuit master cylinder to use in the bigger trucks with the original drum brakes. I know many have done it on the light trucks, but the larger trucks use larger cylinders. My '41 for instance uses 1 1/4" master, 1 1/4" front and 1 1/2 rear cylinders with no hydro-vac. I would expect the smaller dual master cylinders popular to use in the light trucks would not move enough brake fluid to operate the brakes properly.

Joe McNeel

http://mcneelnet.com/~jmcneel/59.html